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1

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Phase-matching mechanism for high-photon-energy harmonics of a long trajectory driven by a midinfrared laser (2012)

Cheng Gong, Jiaming Jiang, Chuang Li, Liwei Song, Zhinan Zeng, Jing Miao, Xiaochun Ge, Yinghui Zheng, Ruxin Li, and Zhizhan Xu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Cheng Gong, Jiaming Jiang, Chuang Li, Liwei Song, Zhinan Zeng, Jing Miao, Xiaochun Ge, Yinghui Zheng, Ruxin Li, and Zhizhan Xu High-order harmonics were generated with neon gas by using 12-fs midinfrared laser pulses with stabilized carrier-envelope phase (CEP). At some specific CEP, a broad “supercontinuum” of the extreme ultraviolet spectrum can be obtained. Two distinct continuous spectral regimes are found by numerical ... [Phys. Rev. A 85, 033410] Published Thu Mar 08, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Effects of photon momentum in nonrelativistic (γ,2e) processes (2012)

A. G. Galstyan, O. Chuluunbaatar, Yu. V. Popov, and B. Piraux

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): A. G. Galstyan, O. Chuluunbaatar, Yu. V. Popov, and B. Piraux We study the effects of nonzero photon momentum on the triply differential cross section (TDCS) for ( γ ,2 e ) processes. Due to the low value of the photon momentum, these effects are weak and manifest only in special kinematical conditions such as the back-to-back emission of the electrons with equal ... [Phys. Rev. A 85, 023418] Published Tue Feb 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Evaporation-limited loading of an atomic trap (2012)

Markus Falkenau, Valentin V. Volchkov, Jahn Rührig, Hannes Gorniaczyk, and Axel Griesmaier

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Markus Falkenau, Valentin V. Volchkov, Jahn Rührig, Hannes Gorniaczyk, and Axel Griesmaier Recently, we have experimentally demonstrated a continuous loading mechanism for an optical dipole trap from a guided atomic beam [ M. Falkenau, V. V. Volchkov, J. Rührig, A. Griesmaier and T. Pfau Phys. Rev. Lett. 106 163002 (2011) ]. The observed evolution of the number of atoms and temperature in... [Phys. Rev. A 85, 023412] Published Tue Feb 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dynamics of D_{3}^{+} slow dissociation induced by intense ultrashort laser pulses (2012)

B. Gaire, J. McKenna, M. Zohrabi, K. D. Carnes, B. D. Esry, and I. Ben-Itzhak

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): B. Gaire, J. McKenna, M. Zohrabi, K. D. Carnes, B. D. Esry, and I. Ben-Itzhak The dissociation of D 3 + in intense ultrashort laser pulses is investigated using an improved coincidence three-dimensional momentum imaging method that allows clear separation of all fragmentation channels and the determination of the kinetic energy release down to zero. Our results, using 10-fs, 79... [Phys. Rev. A 85, 023419] Published Tue Feb 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Theoretical study of angular-resolved two-photon ionization of H_{2} (2012)

Ph. V. Demekhin, B. M. Lagutin, and I. D. Petrov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Ph. V. Demekhin, B. M. Lagutin, and I. D. Petrov Cross sections and angular distribution parameters of electrons ejected via two-photon ionization of the hydrogen molecule by linearly and circularly polarized light are computed in the exciting-photon energy range of 8–14 eV, which covers the first four optical resonant states of the molecule. Phot... [Phys. Rev. A 85, 023416] Published Tue Feb 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Possibility of magic trapping of a three-level system for Rydberg blockade implementation (2012)

Muir J. Morrison and Andrei Derevianko

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-03-13

Beschreibung: Author(s): Muir J. Morrison and Andrei Derevianko The Rydberg blockade mechanism has shown noteworthy promise for scalable quantum computation with neutral atoms. Both qubit states and gate-mediating Rydberg state belong to the same optically trapped atom. The trapping fields, while being essential, induce detrimental decoherence. Here we theoretic... [Phys. Rev. A 85, 033414] Published Mon Mar 12, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Solution of the time-dependent Dirac equation for multiphoton ionization of highly charged hydrogenlike ions (2012)

Yulian V. Vanne and Alejandro Saenz

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-03-10

Beschreibung: Author(s): Yulian V. Vanne and Alejandro Saenz A theoretical study of the intense-field multiphoton ionization of hydrogenlike systems is performed by solving the time-dependent Dirac equation within the dipole approximation. It is shown that the velocity-gauge results agree to the ones in the length gauge only if the negative-energy states are ... [Phys. Rev. A 85, 033411] Published Fri Mar 09, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Analytic theory of high-order-harmonic generation by an intense few-cycle laser pulse (2012)

M. V. Frolov, N. L. Manakov, A. M. Popov, O. V. Tikhonova, E. A. Volkova, A. A. Silaev, N. V. Vvedenskii, and Anthony F. Starace

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-03-14

Beschreibung: Author(s): M. V. Frolov, N. L. Manakov, A. M. Popov, O. V. Tikhonova, E. A. Volkova, A. A. Silaev, N. V. Vvedenskii, and Anthony F. Starace We present a theoretical model for describing the interaction of an electron, weakly bound in a short-range potential, with an intense, few-cycle laser pulse. General definitions for the differential probability of above-threshold ionization and for the yield of high-order-harmonic generation (HHG) ... [Phys. Rev. A 85, 033416] Published Tue Mar 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Experimental studies of partial photodetachment cross sections in K^{−} below the K(7 ^{2}P) threshold (2012)

A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-03-14

Beschreibung: Author(s): A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp A collinear beams apparatus has been used to determine photodetachment cross sections for K − in the photon energy range 4.250–4.360 eV. State-selective detection, utilizing a resonance ionization scheme, was applied to measure partial cross sections for those channels which leave the residual K atom... [Phys. Rev. A 85, 033415] Published Tue Mar 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules (2012)

Wei-Chao Jiang, Oleg I. Tolstikhin, Liang-You Peng, and Qihuang Gong

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-14

Beschreibung: Author(s): Wei-Chao Jiang, Oleg I. Tolstikhin, Liang-You Peng, and Qihuang Gong The physical origin and properties of quasistationary static-field-induced states (SFISs) are discussed. SFISs can be supported by a combination of any atomic or molecular potential and an external static electric field and do not have counterparts in the absence of the field. A resonant tunneling i... [Phys. Rev. A 85, 023404] Published Mon Feb 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Phase dependence of dynamical manipulation of NaI predissociation (2012)

Yuanxing Liu, Yunquan Liu, and Qihuang Gong

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): Yuanxing Liu, Yunquan Liu, and Qihuang Gong We propose a dynamic pump-control scheme to manipulate the molecular predissociation process of NaI using two color few-cycle laser pulses. We excite the NaI molecule with a pump pulse (648 nm, 35 fs) and employ another control laser pulse (7.53 μm, 50 fs) to modify the molecular potential energy su... [Phys. Rev. A 85, 023406] Published Tue Feb 14, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Adiabaticity in the lateral electron-momentum distribution after strong-field ionization (2012)

Jost Henkel, Manfred Lein, Volker Engel, and Ingo Dreissigacker

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Jost Henkel, Manfred Lein, Volker Engel, and Ingo Dreissigacker By solving the time-dependent Schrödinger equation for atoms in short laser pulses of different polarizations, it is shown that in strong-field ionization without rescattering, the lateral width of the electron-momentum distribution corresponds adiabatically to the instantaneous laser field on a sub... [Phys. Rev. A 85, 021402] Published Tue Feb 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Atom slowing via dispersive optical interactions (2012)

M. Hamamda, M. Boustimi, F. Correia, J. Baudon, T. Taillandier-Loize, G. Dutier, F. Perales, and M. Ducloy

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): M. Hamamda, M. Boustimi, F. Correia, J. Baudon, T. Taillandier-Loize, G. Dutier, F. Perales, and M. Ducloy A promising technique of atom slowing is proposed. It is based upon the dispersive interaction of atoms with optical potential pulses generated by a far-off-resonance standing wave modulated in time. Each pulse reduces the velocity by a small amount. By repeating the process thousands of times, the ... [Phys. Rev. A 85, 023417] Published Tue Feb 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Influence of multiple ionization thresholds on harmonic generation from Ar^{+} (2012)

A. C. Brown and H. W. van der Hart

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): A. C. Brown and H. W. van der Hart We apply time-dependent R -matrix theory to investigate harmonic generation from ground-state Ar + with M =0 at a wavelength of 390 nm. Contributions associated with the different 3 s 2 3 p 4 ionization thresholds are assessed, including the interference between these. The dominant contribution originates f... [Phys. Rev. A 86, 063416] Published Wed Dec 26, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Optimal-control theory of harmonic generation (2012)

Ido Schaefer and Ronnie Kosloff

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): Ido Schaefer and Ronnie Kosloff Coherent control of harmonic generation was studied theoretically. A specific harmonic order was targeted. An optimal control theory was employed to find the driving field where restrictions were imposed on the frequency band. Additional restrictions were added to suppress undesired outcomes, such a... [Phys. Rev. A 86, 063417] Published Wed Dec 26, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Excitation of Rydberg wave packets with chirped laser pulses (2012)

J. Preclíková, M. Kozák, D. Fregenal, Ø. Frette, B. Hamre, B. T. Hjertaker, J. P. Hansen, and L. Kocbach

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): J. Preclíková, M. Kozák, D. Fregenal, Ø. Frette, B. Hamre, B. T. Hjertaker, J. P. Hansen, and L. Kocbach We study Rydberg wave packets produced by pairs of time separated femtosecond laser pulses. The time separation ranges from femtosecond to picosecond time scales. The wave packets consist predominantly of f states of principal quantum numbers n =22–32 in Li. With a direct analysis of the field ioniza... [Phys. Rev. A 86, 063418] Published Wed Dec 26, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Evidence of sympathetic cooling of Na^{+} ions by a Na magneto-optical trap in a hybrid trap (2012)

I. Sivarajah, D. S. Goodman, J. E. Wells, F. A. Narducci, and W. W. Smith

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): I. Sivarajah, D. S. Goodman, J. E. Wells, F. A. Narducci, and W. W. Smith A hybrid ion-neutral trap provides an ideal system to study collisional dynamics between ions and neutral atoms. This system provides a general cooling method that can be applied to species that do not have optically accessible transitions and can also potentially cool internal degrees of freedom. T... [Phys. Rev. A 86, 063419] Published Wed Dec 26, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Enhancing photoassociation rates by nonresonant-light control of shape resonances (2012)

Rosario González-Férez and Christiane P. Koch

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): Rosario González-Férez and Christiane P. Koch Photoassociation, assembling molecules from atoms using laser light, is limited by the low density of atom pairs at sufficiently short interatomic separations. Here we show that nonresonant light with intensities of the order of 10 10 W/cm 2 modifies the thermal cloud of atoms, enhancing the Boltzmann... [Phys. Rev. A 86, 063420] Published Wed Dec 26, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Hybrid model for Rydberg gases including exact two-body correlations (2012)

Kilian P. Heeg, Martin Gärttner, and Jörg Evers

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): Kilian P. Heeg, Martin Gärttner, and Jörg Evers A model for the simulation of ensembles of laser-driven Rydberg-Rydberg interacting multilevel atoms is discussed. Our hybrid approach combines an exact two-body treatment of nearby atom pairs with an effective approximate treatment for spatially separated pairs. We propose an optimized evolution eq... [Phys. Rev. A 86, 063421] Published Wed Dec 26, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Attosecond time-delay spectroscopy of the hydrogen molecule (2012)

I. A. Ivanov, A. S. Kheifets, and Vladislav V. Serov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-28

Beschreibung: Author(s): I. A. Ivanov, A. S. Kheifets, and Vladislav V. Serov We apply the concept of photoemission time delay to the process of single-photon one-electron ionization of the H 2 molecule. We demonstrate that, by resolving the photoelectron detection in time on the attosecond scale, one can extract differential photoionization cross sections for particular field... [Phys. Rev. A 86, 063422] Published Thu Dec 27, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Diagrammatic approach to attosecond delays in photoionization (2012)

J. M. Dahlström, T. Carette, and E. Lindroth

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-28

Beschreibung: Author(s): J. M. Dahlström, T. Carette, and E. Lindroth We study laser-assisted photoionization by attosecond pulses using a time-independent formalism based on diagrammatic many-body perturbation theory. Our aim is to provide an ab initio route to the “delays” for this above-threshold ionization process, which is essential for a quantitative understandi... [Phys. Rev. A 86, 061402] Published Thu Dec 27, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Directional spinning of molecules with sequences of femtosecond pulses (2012)

C. Bloomquist, S. Zhdanovich, A. A. Milner, and V. Milner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): C. Bloomquist, S. Zhdanovich, A. A. Milner, and V. Milner We present an analysis of two experimental approaches to controlling the directionality of molecular rotation with ultrashort laser pulses. The two methods are based on the molecular interaction with either a pair of pulses (a “double-kick” scheme) or a longer pulse sequence (a “chiral-pulse-train” ... [Phys. Rev. A 86, 063413] Published Wed Dec 19, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Time-energy analysis of above-threshold ionization in few-cycle laser pulses (2012)

L. Guo, S. S. Han, and J. Chen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-11-14

Beschreibung: Author(s): L. Guo, S. S. Han, and J. Chen A Wigner-distribution-like (WDL) function is used to study the time-energy distribution of a photoelectron emitted from an atom in few-cycle laser fields with different frequencies. The WDL function shows the dependence of ionization probability on time and explicitly demonstrates the transition of ... [Phys. Rev. A 86, 053409] Published Tue Nov 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Valence-shell single photoionization of Kr^{+} ions: Experiment and theory (2012)

G. Hinojosa, A. M. Covington, G. A. Alna'Washi, M. Lu, R. A. Phaneuf, M. M. Sant'Anna, C. Cisneros, I. Álvarez, A. Aguilar, A. L. D. Kilcoyne, A. S. Schlachter, C. P. Ballance, and B. M. McLaughlin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-06

Beschreibung: Author(s): G. Hinojosa, A. M. Covington, G. A. Alna'Washi, M. Lu, R. A. Phaneuf, M. M. Sant'Anna, C. Cisneros, I. Álvarez, A. Aguilar, A. L. D. Kilcoyne, A. S. Schlachter, C. P. Ballance, and B. M. McLaughlin Photoionization of Kr + ions was studied in the energy range from 23.3 to 39.0 eV at a photon energy resolution of 7.5 meV. Absolute measurements were performed by merging beams of Kr + ions and of monochromatized synchrotron undulator radiation. Photoionization (PI) of this Br-like ion is characteriz... [Phys. Rev. A 86, 063402] Published Wed Dec 05, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Theory of attosecond transient-absorption spectroscopy of krypton for overlapping pump and probe pulses (2012)

Stefan Pabst, Arina Sytcheva, Antoine Moulet, Adrian Wirth, Eleftherios Goulielmakis, and Robin Santra

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-18

Beschreibung: Author(s): Stefan Pabst, Arina Sytcheva, Antoine Moulet, Adrian Wirth, Eleftherios Goulielmakis, and Robin Santra We present a fully ab initio calculations for attosecond transient absorption spectroscopy of atomic krypton with overlapping pump and probe pulses. Within the time-dependent configuration interaction singles (TDCIS) approach, we describe the pump step (strong-field ionization using a near-infrared ... [Phys. Rev. A 86, 063411] Published Mon Dec 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Single-site addressing of ultracold atoms beyond the diffraction limit via position-dependent adiabatic passage (2012)

D. Viscor, J. L. Rubio, G. Birkl, J. Mompart, and V. Ahufinger

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-18

Beschreibung: Author(s): D. Viscor, J. L. Rubio, G. Birkl, J. Mompart, and V. Ahufinger We propose a single-site addressing implementation based on the subwavelength localization via adiabatic passage (SLAP) technique. We consider a sample of ultracold neutral atoms loaded into a two-dimensional optical lattice with one atom per site. Each atom is modeled by a three-level Λ system in i... [Phys. Rev. A 86, 063409] Published Mon Dec 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Coherent intense resonant laser pulses lead to interference in the time domain seen in the spectrum of the emitted particles (2012)

Philipp V. Demekhin and Lorenz S. Cederbaum

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-18

Beschreibung: Author(s): Philipp V. Demekhin and Lorenz S. Cederbaum The dynamics of atomic levels resonantly coupled by a coherent and intense short high-frequency laser pulse is discussed and it is advocated that this dynamics is sensitively probed by measuring the spectra of the particles emitted. It is demonstrated that the time envelope of this laser pulse gives... [Phys. Rev. A 86, 063412] Published Mon Dec 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Measurements of intense ultrafast laser-driven D_{3}^{+} fragmentation dynamics (2012)

A. M. Sayler, J. McKenna, B. Gaire, Nora G. Kling, K. D. Carnes, and I. Ben-Itzhak

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-25

Beschreibung: Author(s): A. M. Sayler, J. McKenna, B. Gaire, Nora G. Kling, K. D. Carnes, and I. Ben-Itzhak Experiments on the triatomic hydrogen molecular ion in intense ultrashort laser pulses are important for understanding the fundamentals of polyatomic molecular dynamics and for providing a benchmark for theory. Here we extend our earlier measurements [ Phys. Rev. Lett. 103 103004 (2009) ] to provide... [Phys. Rev. A 86, 033425] Published Mon Sep 24, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Investigation of the generation of high-order harmonics through Bohmian trajectories (2012)

Yang Song, Fu-Ming Guo, Su-Yu Li, Ji-Gen Chen, Si-Liang Zeng, and Yu-Jun Yang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-25

Beschreibung: Author(s): Yang Song, Fu-Ming Guo, Su-Yu Li, Ji-Gen Chen, Si-Liang Zeng, and Yu-Jun Yang We theoretically investigated the generation progress of high-order harmonics utilizing Bohmian trajectories, which are calculated from the accurate numerical wave function. It is found that the harmonic emission spectrum from atoms in an intense laser field calculated by Bohmian trajectories agrees... [Phys. Rev. A 86, 033424] Published Mon Sep 24, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Orientation of doubly excited states in N_{2} (2012)

John E. Furst, T. J. Gay, Joshua Machacek, David Kilkoyne, and Kenneth W. McLaughlin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-03

Beschreibung: Author(s): John E. Furst, T. J. Gay, Joshua Machacek, David Kilkoyne, and Kenneth W. McLaughlin We have measured the total fluorescent intensity and circular polarization of light emitted in 3 p 4 P o →3 s 4 P transitions of excited neutral nitrogen atoms created by the photofragmentation of the N 2 molecule with circularly polarized light having energies between 21 and 26 eV. The intensity measure... [Phys. Rev. A 86, 041401] Published Tue Oct 02, 2012

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Time-dependent analytical R-matrix approach for strong-field dynamics. II. Many-electron systems (2012)

Lisa Torlina, Misha Ivanov, Zachary B. Walters, and Olga Smirnova

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-06

Beschreibung: Author(s): Lisa Torlina, Misha Ivanov, Zachary B. Walters, and Olga Smirnova Ionization of atoms and molecules in intense low-frequency fields is a multielectron process which may leave the ion in different excited states. Within the adiabatic perspective on strong-field ionization, usually referred to as optical tunneling, electrons remaining in the molecular ion are assume... [Phys. Rev. A 86, 043409] Published Fri Oct 05, 2012

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Time-dependent analytical R-matrix approach for strong-field dynamics. I. One-electron systems (2012)

Lisa Torlina and Olga Smirnova

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-06

Beschreibung: Author(s): Lisa Torlina and Olga Smirnova We develop a flexible analytical approach to describe strong-field dynamics in atoms and molecules. The approach is based on the ideas of the R -matrix method. Here, we illustrate and validate our approach by applying it to systems with one active electron bound by the Coulomb potential and benchmark... [Phys. Rev. A 86, 043408] Published Fri Oct 05, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Nondipole effects in attosecond photoelectron streaking (2012)

Maciej Dominik Śpiewanowski and Lars Bojer Madsen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-06

Beschreibung: Author(s): Maciej Dominik Śpiewanowski and Lars Bojer Madsen The influence of nondipole terms on the time delay in photoionization by an extreme-ultraviolet attosecond pulse in the presence of a near-infrared femtosecond laser pulse from 1 s , 2 s , and 2 p states in hydrogen is investigated. In this attosecond photoelectron streaking process, the relative importa... [Phys. Rev. A 86, 045401] Published Fri Oct 05, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Photoexcitation of n≃305 Rydberg states in the presence of an rf drive field (2012)

S. Yoshida, C. O. Reinhold, J. Burgdörfer, S. Ye, and F. B. Dunning

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-10

Beschreibung: Author(s): S. Yoshida, C. O. Reinhold, J. Burgdörfer, S. Ye, and F. B. Dunning The response of highly excited potassium Rydberg states with n ∼305 to a sinusoidal electric drive field in the radio frequency (100–300 MHz) regime is examined by photoexcitation from the 4 s ground state using a uv probe beam. The drive field couples many Rydberg levels simultaneously and results i... [Phys. Rev. A 86, 043415] Published Tue Oct 09, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Attosecond cascades and time delays in one-electron photoionization (2012)

Suren Sukiasyan, Kenichi L. Ishikawa, and Misha Ivanov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-22

Beschreibung: Author(s): Suren Sukiasyan, Kenichi L. Ishikawa, and Misha Ivanov We present time-resolved ab initio study of the attosecond dynamics of electron-electron correlation during single-electron, single XUV-photon ionization of an excited helium atom. We identify multiple time scales in these dynamics, caused by the interplay of the initial shake-up excitation with the... [Phys. Rev. A 86, 033423] Published Fri Sep 21, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Adiabatic theory of ionization by intense laser pulses: Finite-range potentials (2012)

Oleg I. Tolstikhin and Toru Morishita

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-12

Beschreibung: Author(s): Oleg I. Tolstikhin and Toru Morishita The adiabatic theory of ionization of an electron, initially bound in a three-dimensional potential well, by an intense low-frequency laser pulse is developed. The general case of arbitrary time dependence and polarization of the laser field and arbitrary potential which can model an atom or a molec... [Phys. Rev. A 86, 043417] Published Thu Oct 11, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Manipulating one- and two-dimensional stimulated-x-ray resonant-Raman signals in molecules by pulse polarizations (2012)

Daniel Healion, Jason D. Biggs, and Shaul Mukamel

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-29

Beschreibung: Author(s): Daniel Healion, Jason D. Biggs, and Shaul Mukamel The simulation of spontaneous (RIXS) and stimulated x-ray Raman scattering (SXRS) signals in isotropic samples requires rotational averaging of a fourth-rank tensor product of two polarizabilities. Attosecond stimulated x-ray Raman spectroscopy excites multiple valence transitions covered by the pul... [Phys. Rev. A 86, 033429] Published Fri Sep 28, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dissociation dynamics of diatomic molecules in intense laser fields: A scheme for the selection of relevant adiabatic potential curves (2012)

M. Magrakvelidze, C. M. Aikens, and U. Thumm

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-02

Beschreibung: Author(s): M. Magrakvelidze, C. M. Aikens, and U. Thumm We investigated the nuclear dynamics of diatomic molecular ions in intense laser fields by analyzing their fragment kinetic-energy release (KER) spectra as a function of the pump-probe delay τ . Within the Born-Oppenheimer (BO) approximation, we calculated ab initio adiabatic potential-energy curves ... [Phys. Rev. A 86, 023402] Published Wed Aug 01, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Angular and dynamical properties in resonant inelastic x-ray scattering: Case study of chlorine-containing molecules (2012)

Renaud Guillemin, Wayne C. Stolte, Loïc Journel, Stéphane Carniato, Maria Novella Piancastelli, Dennis W. Lindle, and Marc Simon

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-12

Beschreibung: Author(s): Renaud Guillemin, Wayne C. Stolte, Loïc Journel, Stéphane Carniato, Maria Novella Piancastelli, Dennis W. Lindle, and Marc Simon Polarization-dependent resonant inelastic x-ray scattering (RIXS) has been shown to be a probe of molecular-field effects on the electronic structure of isolated molecules. In this experimental analysis we explain the linear dichroism observed in Cl 2 p polarized RIXS following Cl 1 s excitation of a ... [Phys. Rev. A 86, 013407] Published Wed Jul 11, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Entropic enhancement of spatial correlations in a laser-driven Rydberg gas (2012)

C. Ates and I. Lesanovsky

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-12

Beschreibung: Author(s): C. Ates and I. Lesanovsky Laser-driven Rydberg gases are many-body quantum systems that exhibit a pronounced collective excitation behavior due to the strong interaction between atoms in high-lying electronic states. Atoms located within a so-called blockade volume share a single Rydberg excitation, which is dynamically crea... [Phys. Rev. A 86, 013408] Published Wed Jul 11, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Sensitive imaging of electromagnetic fields with paramagnetic polar molecules (2012)

Sergey V. Alyabyshev, Mikhail Lemeshko, and Roman V. Krems

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-14

Beschreibung: Author(s): Sergey V. Alyabyshev, Mikhail Lemeshko, and Roman V. Krems We propose a method for sensitive parallel detection of low-frequency electromagnetic fields based on the fine structure interactions in paramagnetic polar molecules. Compared to the recently implemented scheme employing ultracold 87 Rb atoms by Böhi et al. [ Appl. Phys. Lett. 97 051101 (2010) ], the... [Phys. Rev. A 86, 013409] Published Fri Jul 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Application of a numerical-basis-state method to strong-field excitation and ionization of hydrogen atoms (2012)

Shaohao Chen, Xiang Gao, Jiaming Li, Andreas Becker, and Agnieszka Jaroń-Becker

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-14

Beschreibung: Author(s): Shaohao Chen, Xiang Gao, Jiaming Li, Andreas Becker, and Agnieszka Jaroń-Becker We apply a numerical-basis-state method to study dynamical processes in the interaction of atoms with strong laser pulses. The method is based on the numerical representation of finite-space energy eigenstates of the field-free atomic Hamiltonian in a box on a grid and the expansion of the solution ... [Phys. Rev. A 86, 013410] Published Fri Jul 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Effects of macroscopic propagation on spectra of broadband supercontinuum harmonics and isolated-attosecond-pulse generation: Coherent control of the electron quantum trajectories in two-color laser fields (2012)

Peng-Cheng Li and Shih-I Chu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-14

Beschreibung: Author(s): Peng-Cheng Li and Shih-I Chu Recently it was shown that broadband supercontinuum harmonics can be produced from the long-trajectory electrons in the single-atom response by the coherent control of the electron trajectories through optimized two-color laser fields. Such supercontinuum harmonics can be superposed to generate an i... [Phys. Rev. A 86, 013411] Published Fri Jul 13, 2012

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Above-threshold ionization by few-cycle spatially inhomogeneous fields (2012)

M. F. Ciappina, J. A. Pérez-Hernández, T. Shaaran, J. Biegert, R. Quidant, and M. Lewenstein

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-21

Beschreibung: Author(s): M. F. Ciappina, J. A. Pérez-Hernández, T. Shaaran, J. Biegert, R. Quidant, and M. Lewenstein We present theoretical studies of above-threshold ionization (ATI) produced by spatially inhomogeneous fields. This kind of field appears as a result of the illumination of plasmonic nanostructures and metal nanoparticles with a short laser pulse. We use the time-dependent Schrödinger equation in re... [Phys. Rev. A 86, 023413] Published Mon Aug 20, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Generating non-Gaussian states using collisions between Rydberg polaritons (2012)

Jovica Stanojevic, Valentina Parigi, Erwan Bimbard, Alexei Ourjoumtsev, Pierre Pillet, and Philippe Grangier

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-23

Beschreibung: Author(s): Jovica Stanojevic, Valentina Parigi, Erwan Bimbard, Alexei Ourjoumtsev, Pierre Pillet, and Philippe Grangier We investigate theoretically the deterministic generation of quantum states with negative Wigner functions, by using giant nonlinearities due to collisional interactions between Rydberg polaritons. The state resulting from the polariton interactions may be transferred with high fidelity into a photo... [Phys. Rev. A 86, 021403] Published Wed Aug 22, 2012

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Traveling-wave deceleration of heavy polar molecules in low-field-seeking states (2012)

N. E. Bulleid, R. J. Hendricks, E. A. Hinds, Samuel A. Meek, Gerard Meijer, Andreas Osterwalder, and M. R. Tarbutt

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-23

Beschreibung: Author(s): N. E. Bulleid, R. J. Hendricks, E. A. Hinds, Samuel A. Meek, Gerard Meijer, Andreas Osterwalder, and M. R. Tarbutt We demonstrate the deceleration of heavy polar molecules in low-field-seeking states by combining a cryogenic source and a traveling-wave Stark decelerator. The cryogenic source provides a high-intensity beam with low speed and temperature, and the traveling-wave decelerator provides large decelerat... [Phys. Rev. A 86, 021404] Published Wed Aug 22, 2012

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Simulation of laser-induced quantum dynamics of the electronic and nuclear motion in the ozone molecule on the attosecond time scale (2012)

G. J. Halász, A. Perveaux, B. Lasorne, M. A. Robb, F. Gatti, and Á. Vibók

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-10-23

Beschreibung: Author(s): G. J. Halász, A. Perveaux, B. Lasorne, M. A. Robb, F. Gatti, and Á. Vibók The nonadiabatically coupled dynamics of electrons and nuclei is investigated for the ozone molecule on the attosecond time scale. A coherent superposition of nuclear wave packets located on different electronic states in the Chappuis and in the Hartley bands are created by pump pulses. The multicon... [Phys. Rev. A 86, 043426] Published Mon Oct 22, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Enhancement of optically pumped spin orientation via spin-exchange collisions at low vapor density (2012)

W. Chalupczak, R. M. Godun, P. Anielski, A. Wojciechowski, S. Pustelny, and W. Gawlik

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-05

Beschreibung: Author(s): W. Chalupczak, R. M. Godun, P. Anielski, A. Wojciechowski, S. Pustelny, and W. Gawlik An effect is demonstrated where off-resonant optical pumping is enhanced by spin-exchange collisions, which enables a high degree of spin orientation to be obtained in alkali-metal atoms. The experiment with room-temperature cesium vapor employs radio-frequency spectroscopy under conditions of the n... [Phys. Rev. A 85, 043402] Published Wed Apr 04, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Interferometric thermometry of a single sub-Doppler-cooled atom (2012)

L. Slodička, G. Hétet, N. Röck, S. Gerber, P. Schindler, M. Kumph, M. Hennrich, and R. Blatt

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-05

Beschreibung: Author(s): L. Slodička, G. Hétet, N. Röck, S. Gerber, P. Schindler, M. Kumph, M. Hennrich, and R. Blatt Efficient self-interference of single photons emitted by a sideband-cooled barium ion is demonstrated. First, the technical tools for performing efficient coupling to the quadrupolar transition of a single 138 Ba + ion are presented. We show efficient Rabi oscillations of the internal state of the ion... [Phys. Rev. A 85, 043401] Published Wed Apr 04, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Phase effects in laser-induced electron-positron pair creation (2012)

K. Krajewska and J. Z. Kamiński

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-10

Beschreibung: Author(s): K. Krajewska and J. Z. Kamiński Probability rates of electron-positron pair creation in collisions of a relativistic nucleus with a two-color laser field are calculated using the S -matrix approach. The case when both components of the laser field have commensurate frequencies and comparable strengths is considered. Pronounced inte... [Phys. Rev. A 85, 043404] Published Mon Apr 09, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Auger decay of Ar 2p satellite states studied with a multielectron coincidence method (2012)

M. Nakano, Y. Hikosaka, P. Lablanquie, F. Penent, S.-M. Huttula, I. H. Suzuki, K. Soejima, N. Kouchi, and K. Ito

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-10

Beschreibung: Author(s): M. Nakano, Y. Hikosaka, P. Lablanquie, F. Penent, S.-M. Huttula, I. H. Suzuki, K. Soejima, N. Kouchi, and K. Ito The Auger decay channels of the Ar 2 p satellite states have been investigated using a multielectron coincidence technique, using a magnetic bottle time-of-flight electron spectrometer. For the Ar + (2 p −1 3 p −1 n p ) satellite states the 2 p hole is filled first, while for the Ar + (2 p −1 3 s −1 4 s ) satellite state... [Phys. Rev. A 85, 043405] Published Mon Apr 09, 2012

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Relativistic total cross section and angular distribution for Rayleigh scattering by atomic hydrogen (2012)

L. Safari, P. Amaro, S. Fritzsche, J. P. Santos, and F. Fratini

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-10

Beschreibung: Author(s): L. Safari, P. Amaro, S. Fritzsche, J. P. Santos, and F. Fratini We study the total cross section and angular distribution in Rayleigh scattering by hydrogen atom in the ground state, within the framework of Dirac relativistic equation and second-order perturbation theory. The relativistic states used for the calculations are obtained by making use of the finite ... [Phys. Rev. A 85, 043406] Published Mon Apr 09, 2012

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Complete population transfer in a three-state quantum system by a train of pairs of coincident pulses (2012)

A. A. Rangelov and N. V. Vitanov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-10

Beschreibung: Author(s): A. A. Rangelov and N. V. Vitanov A technique for complete population transfer between the two end states |1〉 and |3〉 of a three-state quantum system with a train of N pairs of resonant and coincident pump and Stokes pulses is introduced. A simple analytic formula is derived for the ratios of the pulse amplitudes in each pair for wh... [Phys. Rev. A 85, 043407] Published Mon Apr 09, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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L-shell photoionization of Ar^{+} to Ar^{3+} ions (2012)

C. Blancard, Ph. Cossé, G. Faussurier, J.-M. Bizau, D. Cubaynes, N. El Hassan, S. Guilbaud, M. M. Al Shorman, E. Robert, X.-J. Liu, C. Nicolas, and C. Miron

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-12

Beschreibung: Author(s): C. Blancard, Ph. Cossé, G. Faussurier, J.-M. Bizau, D. Cubaynes, N. El Hassan, S. Guilbaud, M. M. Al Shorman, E. Robert, X.-J. Liu, C. Nicolas, and C. Miron Absolute photoionization cross sections of Ar + , Ar 2+ , and Ar 3+ ions have been measured in the 250–280 eV photon energy range. These results are compared to theoretical cross sections extracted from two new calculations we performed. They reproduce well the general behavior of the experimental spectr... [Phys. Rev. A 85, 043408] Published Wed Apr 11, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Time-resolved high-harmonic spectroscopy of nonadiabatic dynamics in NO_{2} (2012)

P. M. Kraus, Y. Arasaki, J. B. Bertrand, S. Patchkovskii, P. B. Corkum, D. M. Villeneuve, K. Takatsuka, and H. J. Wörner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-13

Beschreibung: Author(s): P. M. Kraus, Y. Arasaki, J. B. Bertrand, S. Patchkovskii, P. B. Corkum, D. M. Villeneuve, K. Takatsuka, and H. J. Wörner Time-resolved high-harmonic spectroscopy is an emerging approach to measuring coupled electronic and nuclear dynamics in photochemical reactions. A general conceptual and theoretical model for the technique is derived from first principles and applied to study the sensitivity of the technique to non... [Phys. Rev. A 85, 043409] Published Thu Apr 12, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Generation and control of spin-orbit entanglement in atomic pairs (2012)

Xuan Li and Moshe Shapiro

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-17

Beschreibung: Author(s): Xuan Li and Moshe Shapiro We propose a method for producing entangled spin and orbital states in pairs of atoms resulting from the dissociation of diatomic molecules. The method employs the interference between a one-photon and a two-photon process to break the backward-forward symmetry of the dissociation processes. The spi... [Phys. Rev. A 85, 043413] Published Mon Apr 16, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dominant-interaction Hamiltonians for high-order-harmonic generation in laser-assisted collisions (2012)

Carlos Zagoya, Christoph-Marian Goletz, Frank Grossmann, and Jan-Michael Rost

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-13

Beschreibung: Author(s): Carlos Zagoya, Christoph-Marian Goletz, Frank Grossmann, and Jan-Michael Rost We formulate the concept of dominant interaction Hamiltonians to obtain an integrable approximation to the dynamics of an electron exposed to a strong laser field and an atomic potential leading to high-order-harmonic generation. The concept relies on local information in phase space to switch betwe... [Phys. Rev. A 85, 041401] Published Thu Apr 12, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Resonances in photoionization: Cross sections for vibrationally excited H_{2} (2012)

J. Zs. Mezei, I. F. Schneider, E. Roueff, and Ch. Jungen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-14

Beschreibung: Author(s): J. Zs. Mezei, I. F. Schneider, E. Roueff, and Ch. Jungen Multichannel quantum defect theory is used to calculate photoionization cross sections for vibrationally excited diatomic hydrogen. The calculations are based on the state-of-the-art clamped-nuclei potential energy curves and electronic dipole transition moments of Wolniewicz. The calculations indic... [Phys. Rev. A 85, 043411] Published Fri Apr 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Coherent rovibrational revivals in a thermal molecular ensemble (2012)

M. Bitter, E. A. Shapiro, and V. Milner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-14

Beschreibung: Author(s): M. Bitter, E. A. Shapiro, and V. Milner We report an experimental and theoretical study of the evolution of vibrational coherence in a thermal ensemble of nitrogen molecules. Rotational dephasing and rephasing of the vibrational coherence is detected by coherent anti-Stokes Raman scattering. The existence of rovibrational coupling and the... [Phys. Rev. A 85, 043410] Published Fri Apr 13, 2012

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Sympathetic cooling of mixed-species two-ion crystals for precision spectroscopy (2012)

Jannes B. Wübbena, Sana Amairi, Olaf Mandel, and Piet O. Schmidt

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-04-14

Beschreibung: Author(s): Jannes B. Wübbena, Sana Amairi, Olaf Mandel, and Piet O. Schmidt Sympathetic cooling of trapped ions has become an indispensable tool for quantum-information processing and precision spectroscopy. In the simplest situation a single Doppler-cooled ion sympathetically cools another ion which typically has a different mass. We analytically investigate the effect of ... [Phys. Rev. A 85, 043412] Published Fri Apr 13, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Two-electron dynamics in nonlinear double excitation of helium by intense ultrashort extreme-ultraviolet pulses (2012)

Chien-Nan Liu, Akiyoshi Hishikawa, and Toru Morishita

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-12-01

Beschreibung: Author(s): Chien-Nan Liu, Akiyoshi Hishikawa, and Toru Morishita We present a theoretical study for multiphoton double excitation of He atoms exposed to an intense ultrashort extreme-ultraviolet (EUV) pulse, where the photon energy coincides with the transition energy from the ground state to a Rydberg state, by solving the time-dependent Schrödinger equation in ... [Phys. Rev. A 86, 053426] Published Fri Nov 30, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Tracking molecular wave packets in cesium dimers by coherent Raman scattering (2012)

Luqi Yuan, Dmitry Pestov, Robert K. Murawski, Gombojav O. Ariunbold, Miaochan Zhi, Xi Wang, Vladimir A. Sautenkov, Yuri V. Rostovtsev, Torsten Siebert, and Alexei V. Sokolov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-01

Beschreibung: Author(s): Luqi Yuan, Dmitry Pestov, Robert K. Murawski, Gombojav O. Ariunbold, Miaochan Zhi, Xi Wang, Vladimir A. Sautenkov, Yuri V. Rostovtsev, Torsten Siebert, and Alexei V. Sokolov We explore wave-packet dynamics in the ground X 1 Σ g + and excited B 1 Π u states of cesium dimers (Cs 2 ). In particular, we study the dependence of the wave-packet dynamics on the relative timing between femtosecond pump, Stokes, and probe pulses in a nondegenerate BOXCARS beam geometry, which are commo... [Phys. Rev. A 86, 023421] Published Fri Aug 31, 2012

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Dispersion-shaped ac Stark phase shift of Ca intercombination transitions with a time-domain atom interferometer (2012)

Tomoya Akatsuka, Kazuya Tanihara, Kenji Komito, Kentaro Ooi, and Atsuo Morinaga

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-29

Beschreibung: Author(s): Tomoya Akatsuka, Kazuya Tanihara, Kenji Komito, Kentaro Ooi, and Atsuo Morinaga A time-domain atom interferometer with a cold calcium atomic ensemble has been developed with a phase resolution σ φ =140/√ τ mrad/s 1/2 at the integration time τ . Using this atom interferometer, the dispersion-shaped ac Stark phase shift with a sharp reversal on resonance was demonstrated under the per... [Phys. Rev. A 86, 023418] Published Tue Aug 28, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Role of excited states in the emission times of harmonics from asymmetric molecules (2012)

Yanjun Chen and Bing Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-24

Beschreibung: Author(s): Yanjun Chen and Bing Zhang We investigate the emission times of high-order harmonics from the asymmetric molecule HeH 2+ exposed to intense laser fields numerically and analytically. We show that for each laser cycle, the emission times of harmonics follow two characteristic electron trajectories. The first one matches the pre... [Phys. Rev. A 86, 023415] Published Thu Aug 23, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Doppler cooling of three-level Λ systems by coherent pulse trains (2012)

Ekaterina Ilinova and Andrei Derevianko

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-28

Beschreibung: Author(s): Ekaterina Ilinova and Andrei Derevianko We explore the possibility of decelerating and Doppler cooling an ensemble of three-level Λ -type atoms by a coherent train of short, nonoverlapping laser pulses. We show that Λ atoms can be Doppler cooled without additional repumping of the population from the intermediate ground state. We derive an... [Phys. Rev. A 86, 023417] Published Mon Aug 27, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Characterization of laser cooling in a high-magnetic-field atom trap (2012)

E. Paradis, S. Zigo, K. Z. Hu, and G. Raithel

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-28

Beschreibung: Author(s): E. Paradis, S. Zigo, K. Z. Hu, and G. Raithel We describe cooling and trapping of both 85 Rb and 87 Rb in a range of magnetic fields up to 2.6 T. Atoms are injected from a low-field pyramidal magneto-optical trap and recaptured in a high-magnetic-field atom trap. The atoms are cooled and trapped by a six-beam optical molasses via the 5 S 1/2 | m I , m J =... [Phys. Rev. A 86, 023416] Published Mon Aug 27, 2012

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Double photoionization of the hydrogen molecule from the viewpoint of the time-delay theory (2012)

I. A. Ivanov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-29

Beschreibung: Author(s): I. A. Ivanov We studied angular dependency of the time delay in one-photon two-electron photoionization of the hydrogen molecule. Time delay as a function of the angle between velocities of the escaping electrons was shown to have poles at the point corresponding to the kinematic nodes of the reaction. Study of ... [Phys. Rev. A 86, 023419] Published Tue Aug 28, 2012

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Structure and calculation of field-induced free-free transition matrix elements in many-electron atoms (2012)

Yannis Komninos, Theodoros Mercouris, and Cleanthes A. Nicolaides

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-31

Beschreibung: Author(s): Yannis Komninos, Theodoros Mercouris, and Cleanthes A. Nicolaides In earlier work [ Phys. Rev. A 65 043412 (2002) ] we examined the description of atom-radiation coupling in terms of the multipolar Hamiltonian rather than the minimal coupling one, and reached the conclusion that the simple operator D S F ( r )={ r , r 〈 r 0 r 0 , r ≥ r 0 constitutes a good approximation to the f... [Phys. Rev. A 86, 023420] Published Thu Aug 30, 2012

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Resonance fluorescence in ultrafast and intense x-ray free-electron-laser pulses (2012)

Stefano M. Cavaletto, Christian Buth, Zoltán Harman, Elliot P. Kanter, Stephen H. Southworth, Linda Young, and Christoph H. Keitel

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-05

Beschreibung: Author(s): Stefano M. Cavaletto, Christian Buth, Zoltán Harman, Elliot P. Kanter, Stephen H. Southworth, Linda Young, and Christoph H. Keitel The spectrum of resonance fluorescence is calculated for a two-level system excited by an intense, ultrashort x-ray pulse made available, for instance, by free-electron lasers such as the Linac Coherent Light Source. We allow for inner-shell hole decay widths and destruction of the system by further... [Phys. Rev. A 86, 033402] Published Tue Sep 04, 2012

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Evidence for interatomic Coulombic decay in Xe K-shell-vacancy decay of XeF_{2} (2012)

R. W. Dunford, S. H. Southworth, D. Ray, E. P. Kanter, B. Krässig, L. Young, D. A. Arms, E. M. Dufresne, D. A. Walko, O. Vendrell, S.-K. Son, and R. Santra

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-05

Beschreibung: Author(s): R. W. Dunford, S. H. Southworth, D. Ray, E. P. Kanter, B. Krässig, L. Young, D. A. Arms, E. M. Dufresne, D. A. Walko, O. Vendrell, S.-K. Son, and R. Santra Charge production, charge redistribution, and ion fragmentation are explored in the decay of a Xe K -shell vacancy in XeF 2 . Coincidence measurements of all ionic fragments in XeF 2 provide evidence that an interatomic-Coulombic-decay-like (ICD-like) process plays a role in the cascade decay. The signa... [Phys. Rev. A 86, 033401] Published Tue Sep 04, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dark-state suppression and optimization of laser cooling and fluorescence in a trapped alkaline-earth-metal single ion (2012)

T. Lindvall, M. Merimaa, I. Tittonen, and A. A. Madej

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-05

Beschreibung: Author(s): T. Lindvall, M. Merimaa, I. Tittonen, and A. A. Madej We study the formation and destabilization of dark states in a single trapped 88 Sr + ion caused by the cooling and repumping laser fields required for Doppler cooling and fluorescence detection of the ion. By numerically solving the time-dependent density matrix equations for the eight-level system c... [Phys. Rev. A 86, 033403] Published Tue Sep 04, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Guiding of Rydberg atoms in a high-gradient magnetic guide (2012)

M. Traxler, R. E. Sapiro, C. Hempel, K. Lundquist, E. P. Power, and G. Raithel

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-21

Beschreibung: Author(s): M. Traxler, R. E. Sapiro, C. Hempel, K. Lundquist, E. P. Power, and G. Raithel We study the guiding of 87 Rb 59 D 5/2 Rydberg atoms in a linear, high-gradient, two-wire magnetic guide. Time-delayed microwave ionization and ion detection are used to probe the Rydberg atom motion. We observe guiding of Rydberg atoms over a period of 5 ms following excitation. The decay time of the ... [Phys. Rev. A 86, 023414] Published Mon Aug 20, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Single-photon double ionization of H_{2} away from equilibrium: A showcase of two-center electron interference (2012)

Vladislav V. Serov, I. A. Ivanov, and A. S. Kheifets

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-16

Beschreibung: Author(s): Vladislav V. Serov, I. A. Ivanov, and A. S. Kheifets We demonstrate the effect of two-center interference on single-photon double ionization [double photoionization (DPI)] of the aligned H 2 molecule when it shrinks or expands from the equilibrium internuclear distance. This interference affects the first stage of the DPI process in which the primary p... [Phys. Rev. A 86, 025401] Published Wed Aug 15, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Photoionization of heliumlike ions with excitation of nl states (2012)

A. I. Mikhailov and A. V. Nefiodov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-18

Beschreibung: Author(s): A. I. Mikhailov and A. V. Nefiodov Photoionization of heliumlike targets accompanied by transition of the residual ions into the arbitrary n l state is studied. The method of nonrelativistic perturbation theory with respect to the interelectron interaction is employed. Cross sections are deduced in the form of universal scalings, whic... [Phys. Rev. A 86, 013413] Published Tue Jul 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Mutual influence of locality and chaotic dynamics on quantum controllability (2012)

S. Kallush and R. Kosloff

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-24

Beschreibung: Author(s): S. Kallush and R. Kosloff Quantum control tasks are classified either as classical-like or as quantum requiring interference of pathways. We study the generation of interference pathways and relate them to the fidelity of the control target at a fixed time for various tasks. The model drift Hamiltonian studied is the two-dim... [Phys. Rev. A 86, 013420] Published Mon Jul 23, 2012

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Rate-equation approach to cavity-mediated laser cooling (2012)

Tony Blake, Andreas Kurcz, and Almut Beige

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-24

Beschreibung: Author(s): Tony Blake, Andreas Kurcz, and Almut Beige The cooling rate for cavity-mediated laser cooling scales as the Lamb-Dicke parameter η squared. A proper analysis of the cooling process hence needs to take terms up to η 2 in the system dynamics into account. In this paper, we present such an analysis for a standard scenario of cavity-mediated lase... [Phys. Rev. A 86, 013419] Published Mon Jul 23, 2012

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Strong-field photodetachment of H^{−} by few-cycle laser pulses (2012)

S. F. C. Shearer and C. R. J. Addis

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-06-13

Beschreibung: Author(s): S. F. C. Shearer and C. R. J. Addis The recent adiabatic saddle-point method of Shearer et al. [ Phys. Rev. A 84 033409 (2011) ] is applied to study strong-field photodetachment of H − by few-cycle linearly polarized laser pulses of frequencies near the two-photon detachment threshold. The behavior of the saddle points in the complex-t... [Phys. Rev. A 85, 063409] Published Tue Jun 12, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Simultaneous laser cooling of multiple atomic species using an optical frequency comb (2012)

D. Aumiler and T. Ban

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-06-21

Beschreibung: Author(s): D. Aumiler and T. Ban We study Doppler cooling of atoms using a frequency comb and develop a theory to quantitatively describe the process by investigating the interaction of two-level atoms with two counterpropagating pulse trains. We derive the radiative force on atoms and show that each comb mode effectively acts as a... [Phys. Rev. A 85, 063412] Published Wed Jun 20, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Heating mechanisms in radio-frequency-driven ultracold plasmas (2012)

P. W. Smorenburg, L. P. J. Kamp, and O. J. Luiten

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-06-21

Beschreibung: Author(s): P. W. Smorenburg, L. P. J. Kamp, and O. J. Luiten Several mechanisms by which an external electromagnetic field influences the temperature of a plasma are studied analytically and specialized to the system of an ultracold plasma (UCP) driven by a uniform radio-frequency (rf) field. Heating through collisional absorption is reviewed and applied to U... [Phys. Rev. A 85, 063413] Published Wed Jun 20, 2012

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Loading of a surface-electrode ion trap from a remote, precooled source (2012)

Jeremy M. Sage, Andrew J. Kerman, and John Chiaverini

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-21

Beschreibung: Author(s): Jeremy M. Sage, Andrew J. Kerman, and John Chiaverini We demonstrate loading of ions into a surface-electrode trap (SET) from a remote, laser-cooled source of neutral atoms. We first cool and load ∼ 10 6 neutral 88 Sr atoms into a magneto-optical trap from an oven that has no line of sight with the SET. The cold atoms are then pushed with a resonant laser... [Phys. Rev. A 86, 013417] Published Fri Jul 20, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Efficient control of electron localization by subcycle waveform synthesis (2012)

Pengfei Lan, Eiji J. Takahashi, and Katsumi Midorikawa

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-24

Beschreibung: Author(s): Pengfei Lan, Eiji J. Takahashi, and Katsumi Midorikawa We propose and demonstrate an efficient scheme for steering the electron localization of hydrogen molecules and their isotopes. Our scheme is based on the idea of subcycle waveform shaping by synthesizing coherent multicycle IR pulses of different wavelengths. This scheme leads to a good balance bet... [Phys. Rev. A 86, 013418] Published Mon Jul 23, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Molecular Siegert states in an electric field (2012)

Linda Hamonou, Toru Morishita, and Oleg I. Tolstikhin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-17

Beschreibung: Author(s): Linda Hamonou, Toru Morishita, and Oleg I. Tolstikhin The Siegert states of atoms and molecules in a static electric field are the solutions of the stationary Schrödinger equation satisfying the regularity and outgoing-wave boundary conditions. Recently, an efficient method for calculating Siegert states in the single-active-electron approximation base... [Phys. Rev. A 86, 013412] Published Mon Jul 16, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Nuclear interference processes in the dissociation of H_{2}^{+} in short vuv laser fields (2012)

Valery Mezoui Ndo, Luc Owono Owono, Bernard Piraux, Samira Barmaki, Morten Førre, and Henri Bachau

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-19

Beschreibung: Author(s): Valery Mezoui Ndo, Luc Owono Owono, Bernard Piraux, Samira Barmaki, Morten Førre, and Henri Bachau We use a L 2 -discretization technique for solving the time-dependent Schrödinger equation for H 2 + interacting with a short vuv laser pulse, in the Born-Oppenheimer approximation. The calculations include the electronic three-dimensional and vibrational one-dimensional motions. In this approach, we us... [Phys. Rev. A 86, 013416] Published Wed Jul 18, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Classical theory of high-field atomic ionization using elliptical polarization (2012)

Xu Wang and J. H. Eberly

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-26

Beschreibung: Author(s): Xu Wang and J. H. Eberly Important information about strong-field atomic or molecular ionization can be missed when using linearly polarized laser fields. The field strength at which an electron was ionized and the time during a pulse of the ionization event are examples of such missing information. In treating single-, dou... [Phys. Rev. A 86, 013421] Published Wed Jul 25, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Electron distributions in nonlinear Compton scattering (2012)

Madalina Boca, Victor Dinu, and Viorica Florescu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-18

Beschreibung: Author(s): Madalina Boca, Victor Dinu, and Viorica Florescu Based on quantum theory, we investigate the distribution of the electrons scattered in the nonlinear Compton effect by an electromagnetic plane wave. The monochromatic case, examined in detail, reveals features of the electron distribution that are useful in the understanding of the pulsed plane-wav... [Phys. Rev. A 86, 013414] Published Tue Jul 17, 2012

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Tracing nuclear-wave-packet dynamics in singly and doubly charged states of N_{2} and O_{2} with XUV-pump–XUV-probe experiments (2012)

M. Magrakvelidze, O. Herrwerth, Y. H. Jiang, A. Rudenko, M. Kurka, L. Foucar, K. U. Kühnel, M. Kübel, Nora G. Johnson, C. D. Schröter, S. Düsterer, R. Treusch, M. Lezius, I. Ben-Itzhak, R. Moshammer, J. Ullrich, M. F. Kling, and U. Thumm

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-07-19

Beschreibung: Author(s): M. Magrakvelidze, O. Herrwerth, Y. H. Jiang, A. Rudenko, M. Kurka, L. Foucar, K. U. Kühnel, M. Kübel, Nora G. Johnson, C. D. Schröter, S. Düsterer, R. Treusch, M. Lezius, I. Ben-Itzhak, R. Moshammer, J. Ullrich, M. F. Kling, and U. Thumm We traced the femtosecond nuclear-wave-packet dynamics in ionic states of oxygen and nitrogen diatomic molecules employing 38-eV XUV-pump–XUV-probe experiments at the free-electron laser in Hamburg (FLASH). The nuclear dynamics is monitored via the detection of coincident ionic fragments using a rea... [Phys. Rev. A 86, 013415] Published Wed Jul 18, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Two-photon ionization of hydrogen and hydrogenlike ions: Retardation effects on differential and total generalized cross sections (2012)

Viorica Florescu, Olimpia Budriga, and Henri Bachau

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-15

Beschreibung: Author(s): Viorica Florescu, Olimpia Budriga, and Henri Bachau We investigate retardation effects in two-photon ionization from the ground state of low- Z hydrogenic atoms for photon energies ranging from 20 eV to 25 keV, using the general formulas of nonrelativistic second-order perturbation theory, including retardation. Our numerical calculations, including a... [Phys. Rev. A 86, 033413] Published Fri Sep 14, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Effect of screening by external charges on the atomic orbitals and photoinduced processes within the Hartree-Fock-Slater atom (2012)

Robert Thiele, Sang-Kil Son, Beata Ziaja, and Robin Santra

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-11

Beschreibung: Author(s): Robert Thiele, Sang-Kil Son, Beata Ziaja, and Robin Santra X-ray free-electron lasers (XFELs) are a promising tool for the structural determination of macro- and biomolecules, using coherent diffractive imaging. During imaging, the intense XFEL pulses also efficiently ionize the molecules, so it is important to estimate how the charged environment within th... [Phys. Rev. A 86, 033411] Published Mon Sep 10, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Robust two-dimensional subrecoil Raman cooling by adiabatic transfer in a tripod atomic system (2012)

Vladimir S. Ivanov, Yuri V. Rozhdestvensky, and Kalle-Antti Suominen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-11

Beschreibung: Author(s): Vladimir S. Ivanov, Yuri V. Rozhdestvensky, and Kalle-Antti Suominen We demonstrate two-dimensional robust Raman cooling in a four-level tripod system, in which velocity selective population transfer is achieved by a stimulated Raman adiabatic passage. In contrast to basic two-dimensional Raman cooling with square-envelope pulses [ Phys. Rev. A 83 023407 (2011) ], th... [Phys. Rev. A 86, 033409] Published Mon Sep 10, 2012

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Spontaneous-emission-induced transition rates between atomic states in optical lattices (2012)

Jean-Félix Riou, Aaron Reinhard, Laura A. Zundel, and David S. Weiss

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-12

Beschreibung: Author(s): Jean-Félix Riou, Aaron Reinhard, Laura A. Zundel, and David S. Weiss We derive a general expression for the spontaneous-emission-induced transition rates between the atomic states of atoms trapped in far-detuned optical potentials, taking into account both their internal and external degrees of freedom. We apply this result to atoms trapped in deep optical lattices. ... [Phys. Rev. A 86, 033412] Published Tue Sep 11, 2012

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Enhancing electron localization in molecular dissociation by two-color mid- and near-infrared laser fields (2012)

Kunlong Liu, Qingbin Zhang, and Peixiang Lu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-11

Beschreibung: Author(s): Kunlong Liu, Qingbin Zhang, and Peixiang Lu The control of dissociation pathways of H 2 + through individual manipulations of nuclear vibration and electronic transfers is theoretically studied by using the two-color mid- and near-infrared laser fields. We show that the time-delayed weak near-infrared pulse can steer the electron localization b... [Phys. Rev. A 86, 033410] Published Mon Sep 10, 2012

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Dipole-dipole-coupled double-Rydberg molecules (2012)

Martin Kiffner, Hyunwook Park, Wenhui Li, and T. F. Gallagher

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-11

Beschreibung: Author(s): Martin Kiffner, Hyunwook Park, Wenhui Li, and T. F. Gallagher We show that the dipole-dipole interaction between two Rydberg atoms can give rise to long-range molecules. The binding potential arises from two states that converge to different separated-atom asymptotes. These states interact weakly at large distances, but start to repel each other strongly as th... [Phys. Rev. A 86, 031401] Published Mon Sep 10, 2012

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Ion–neutral-atom sympathetic cooling in a hybrid linear rf Paul and magneto-optical trap (2012)

D. S. Goodman, I. Sivarajah, J. E. Wells, F. A. Narducci, and W. W. Smith

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-11

Beschreibung: Author(s): D. S. Goodman, I. Sivarajah, J. E. Wells, F. A. Narducci, and W. W. Smith Long-range polarization forces between ions and neutral atoms result in large elastic scattering cross sections (e.g., ∼ 10 6 a.u. for Na-Na + or Na-Ca + at cold and ultracold temperatures). This suggests that a hybrid ion-neutral trap should offer a general means for significant sympathetic cooling o... [Phys. Rev. A 86, 033408] Published Mon Sep 10, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Digitale ISSN: 1094-1622

Thema: Physik

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Excitation suppression due to interactions between microwave-dressed Rydberg atoms (2012)

E. Brekke, J. O. Day, and T. G. Walker

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-08

Beschreibung: Author(s): E. Brekke, J. O. Day, and T. G. Walker Atom-atom interactions within a small volume were investigated through the excitation of ultracold Rb atoms. The application of microwaves enhances these interactions, causing the suppression of Rydberg state excitation. The suppression of Rydberg atom excitation was both qualitatively observed and ... [Phys. Rev. A 86, 033406] Published Fri Sep 07, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Photoassociation to the 2^{1}Σ_{g}^{+} state in ultracold ^{85}Rb_{2} in the presence of a shape resonance (2012)

M. A. Bellos, R. Carollo, D. Rahmlow, J. Banerjee, E. E. Eyler, P. L. Gould, and W. C. Stwalley

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-08

Beschreibung: Author(s): M. A. Bellos, R. Carollo, D. Rahmlow, J. Banerjee, E. E. Eyler, P. L. Gould, and W. C. Stwalley We report the observation of photoassociation to the 2 1 Σ g + state of 85 Rb 2 . We have observed two vibrational levels ( v ′ =98,99) below the 5 s 1/2 +5 p 1/2 atomic limit and 11 vibrational levels ( v ′ =102–112) above it. The photoassociation—and subsequent spontaneous emission—occur predominantly between 15 ... [Phys. Rev. A 86, 033407] Published Fri Sep 07, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Two-center interference effects on the orientation dependence of the strong-field double-ionization yields for hydrogen molecules (2012)

W. Li and J. Liu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-15

Beschreibung: Author(s): W. Li and J. Liu In the present paper we investigate the orientation dependence of the nonsequential double ionization (NSDI) of a hydrogen molecule (H 2 ) exposed to a strong laser field analytically within the strong-field approximation. Our calculations demonstrate that the NSDI yields can increase with the increas... [Phys. Rev. A 86, 033414] Published Fri Sep 14, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Superparabolic level-glancing models for two-state quantum systems (2012)

J. Lehto and K.-A. Suominen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-09-15

Beschreibung: Author(s): J. Lehto and K.-A. Suominen Level crossing models for two-state quantum systems are applicable to a wide variety of physical problems. We address the special case of level glancing, i.e., when energy levels reach a degeneracy at a specific point of time, but never actually cross. The simplest model with such behavior is the pa... [Phys. Rev. A 86, 033415] Published Fri Sep 14, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Optimal thickness of rectangular superconducting microtraps for cold atomic gases (2012)

A. Markowsky, A. Zare, V. Graber, and T. Dahm

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-18

Beschreibung: Author(s): A. Markowsky, A. Zare, V. Graber, and T. Dahm We study superconducting microtraps with rectangular shapes for cold atomic gases. We present a general argument why microtraps open if brought close to the surface of the superconductor. We show that for a given width of the strips there exists an optimal thickness under which the closest distance ... [Phys. Rev. A 86, 023412] Published Fri Aug 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Photoionization spectra by intense linear, circular, and elliptic polarized lasers (2012)

C. H. Raymond Ooi, Wai; Loon Ho, and A. D. Bandrauk

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-18

Beschreibung: Author(s): C. H. Raymond Ooi, WaiLoon Ho, and A. D. Bandrauk We study the characteristics of ionization rates of an atom by an intense laser field using an extension of Keldysh theory. High-order semianalytical expressions are obtained for linear, circular, and elliptically polarized fields. We compare the features of the new rates with Keldysh analytical res... [Phys. Rev. A 86, 023410] Published Fri Aug 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Decoherence effects on quantum control by reverse optimized pulse sequences (2012)

C. A. Estrada Guerra, D. Velasco Villamizar, and Luis G. C. Rego

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2012-08-18

Beschreibung: Author(s): C. A. Estrada Guerra, D. Velasco Villamizar, and Luis G. C. Rego The external coherent control over the dynamics of quantum systems has been the aim of many studies in recent years, and several theoretical frameworks have been devised for that purpose. However, several of the proposed methods have been developed to control isolated quantum systems, disregarding t... [Phys. Rev. A 86, 023411] Published Fri Aug 17, 2012

Schlagwort(e): Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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