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Application of the complex Kohn variational method to attosecond spectroscopy (2018)

N. Douguet, B. I. Schneider, and L. Argenti

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-07

Description: Author(s): N. Douguet, B. I. Schneider, and L. Argenti The complex Kohn variational method is extended to compute light-driven electronic transitions between continuum wave functions in atomic and molecular systems. This development enables the study of multiphoton processes in the perturbative regime for arbitrary light polarization. As a proof of prin... [Phys. Rev. A 98, 023403] Published Mon Aug 06, 2018

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Laser cooling by sawtooth-wave adiabatic passage (2018)

John P. Bartolotta, Matthew A. Norcia, Julia R. K. Cline, James K. Thompson, and Murray J. Holland

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-07

Description: Author(s): John P. Bartolotta, Matthew A. Norcia, Julia R. K. Cline, James K. Thompson, and Murray J. Holland We provide a theoretical analysis for a recently demonstrated cooling method. Two-level particles undergo successive adiabatic transfers upon interaction with counterpropagating laser beams that are repeatedly swept over the transition frequency. We show that particles with narrow linewidth transiti... [Phys. Rev. A 98, 023404] Published Mon Aug 06, 2018

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Analytical approach to Coulomb focusing in strong-field ionization. I. Nondipole effects (2018)

Jiří Daněk, Karen Z. Hatsagortsyan, and Christoph H. Keitel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-14

Description: Author(s): Jiří Daněk, Karen Z. Hatsagortsyan, and Christoph H. Keitel The role of the Coulomb potential of the atomic core for the creation of caustics in the photoelectron momentum distribution for tunneling ionization in a linearly polarized strong laser field, commonly termed Coulomb focusing, is investigated within classical theory beyond the dipole approximation.... [Phys. Rev. A 97, 063409] Published Wed Jun 13, 2018

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Intrapulse impact processes in dense-gas femtosecond laser filamentation (2018)

Dmitri A. Romanov, Xiaohui Gao, Alexander L. Gaeta, and Robert J. Levis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-15

Description: Author(s): Dmitri A. Romanov, Xiaohui Gao, Alexander L. Gaeta, and Robert J. Levis The processes of energy gain and redistribution in a dense gas subject to an intense ultrashort laser pulse are investigated theoretically for the case of high-pressure argon. The electrons released via strong-field ionization and driven by an oscillating laser field collide with neutral neighbor at... [Phys. Rev. A 97, 063411] Published Thu Jun 14, 2018

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Driving-laser ellipticity dependence of high-order harmonic generation in graphene (2018)

Candong Liu, Yinghui Zheng, Zhinan Zeng, and Ruxin Li

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): Candong Liu, Yinghui Zheng, Zhinan Zeng, and Ruxin Li High-order harmonic generation in graphene driven by the elliptically polarized midinfrared driving pulse is theoretically investigated by solving the two-band semiconductor Bloch equation in the Houston basis under the tight-binding approximation. It is found that the maximal harmonic yield occurs ... [Phys. Rev. A 97, 063412] Published Fri Jun 15, 2018

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Revisiting the Floquet-Bloch theory for an exactly solvable model of one-dimensional crystals in strong laser fields (2018)

Tatsuhiko N. Ikeda

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-19

Description: Author(s): Tatsuhiko N. Ikeda We revisit the Floquet-Bloch eigenstates of a one-dimensional electron gas in the presence of the periodic Kronig-Penney potential and an oscillating electric field. Considering the appropriate boundary conditions for the wave function and its derivative, we derive the determining equations for the ... [Phys. Rev. A 97, 063413] Published Mon Jun 18, 2018

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Dissociation dynamics of the water dication following one-photon double ionization. I. Theory (2018)

Zachary L. Streeter, Frank L. Yip, Robert R. Lucchese, Benoit Gervais, Thomas N. Rescigno, and C. William McCurdy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): Zachary L. Streeter, Frank L. Yip, Robert R. Lucchese, Benoit Gervais, Thomas N. Rescigno, and C. William McCurdy The measurement of the triple differential cross section in the body frame for double photoionization of a molecule can be made in principle by detecting the ionic fragments and the two photoelectrons in coincidence—but only if the dynamics and geometry of dissociation of the doubly charged molecula... [Phys. Rev. A 98, 053429] Published Mon Nov 26, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Two-color phase-of-the-phase spectroscopy with circularly polarized laser pulses (2018)

V. A. Tulsky, M. A. Almajid, and D. Bauer

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): V. A. Tulsky, M. A. Almajid, and D. Bauer Phase-of-the-phase spectroscopy using two-color collinearly polarized laser pulses has been introduced and experimentally applied to strong-field tunneling ionization by Skruszewicz et al. , Phys. Rev. Lett. 115 , 043001 (2015) and recently to multiphoton ionization by Almajid , J. Phys. B: At. Mol. ... [Phys. Rev. A 98, 053433] Published Mon Nov 26, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Light-dressed states under intense optical near fields (2018)

Takashi Takeuchi, Tokuei Sako, and Katsuyuki Nobusada

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-29

Description: Author(s): Takashi Takeuchi, Tokuei Sako, and Katsuyuki Nobusada We studied the excitation dynamics of a finite quantum system with an intense optical near field (ONF) from a perspective of light-dressed states. A simple model consisting of a single electron and a nanosized short dipole source were employed. By calculating the time-dependent wave function subject... [Phys. Rev. A 98, 053440] Published Wed Nov 28, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Resonant enhancement of an oscillating electric field in an atom (2018)

V. V. Flambaum and I. B. Samsonov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): V. V. Flambaum and I. B. Samsonov When an atom is placed into an oscillating electric field with frequency far from atomic resonances, the atomic electrons partly shield this field at the nucleus. It is conjectured that when the frequency of an electric field reaches an atomic resonance, the electric field at the nucleus may be sign... [Phys. Rev. A 98, 053437] Published Tue Nov 27, 2018

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Longitudinal momentum of the electron at the tunneling exit (2018)

Ruihua Xu, Tao Li, and Xu Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): Ruihua Xu, Tao Li, and Xu Wang The longitudinal momentum of the electron at the tunneling exit is a useful quantity to make sense of the tunneling ionization process. It was usually assumed to be zero from a classical argument, but recent experiments show that it must be nonzero in order to explain the measured electron momentum ... [Phys. Rev. A 98, 053435] Published Tue Nov 27, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Transient gain from ${{\mathrm{N}}_{2}}^{+}$ in light filaments (2018)

Ladan Arissian, Brian Kamer, Ali Rastegari, D. M. Villeneuve, and Jean-Claude Diels

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): Ladan Arissian, Brian Kamer, Ali Rastegari, D. M. Villeneuve, and Jean-Claude Diels We present our results on the emissions from N 2 + pumped with ultrafast filaments using high-resolution pump probe. Our result shows the phase relation between transition lines at earlier delays. We show that the gain on transition lines extends beyond the time when coherence is lost. [Phys. Rev. A 98, 053438] Published Tue Nov 27, 2018

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Dielectric properties of cubic boron nitride modulated by an ultrashort laser pulse (2018)

Xiaoshuang Kong, Feng Wang, Xiaoqin Zhang, Zehui Liu, and Xiaoli Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): Xiaoshuang Kong, Feng Wang, Xiaoqin Zhang, Zehui Liu, and Xiaoli Wang The transient dielectric responses of cubic boron nitride (cBN) modulated by an ultrashort laser pulse are introduced based on time-dependent density functional theory calculations. We theoretically investigate whether an ultrashort laser pulse is able to reversibly drive the electric and optical pr... [Phys. Rev. A 98, 053439] Published Tue Nov 27, 2018

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Simultaneous control of harmonic yield and energy cutoff of high-order harmonic generation using seeded plasmonically enhanced fields (2018)

Irfana N. Ansari, M. S. Mrudul, Marcelo F. Ciappina, Maciej Lewenstein, and Gopal Dixit

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-07

Description: Author(s): Irfana N. Ansari, M. S. Mrudul, Marcelo F. Ciappina, Maciej Lewenstein, and Gopal Dixit We study high-order harmonic generation (HHG) driven by seeded plasmonically enhanced fields. On one hand, plasmonically enhanced fields have shown a great potential to extend the HHG cutoff, an instrumental prerequisite for the generation of attosecond pulses. On another hand, the use of XUV seeds ... [Phys. Rev. A 98, 063406] Published Thu Dec 06, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Photon-momentum transfer in diatomic molecules: An ab initio study (2018)

Hao Liang, Mu-Xue Wang, Xiang-Ru Xiao, Qihuang Gong, and Liang-You Peng

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-14

Description: Author(s): Hao Liang, Mu-Xue Wang, Xiang-Ru Xiao, Qihuang Gong, and Liang-You Peng For a molecule, the two-center interference and the molecular scattering phase of the electron are important for almost all the processes that may occur in a laser field. In this study, we investigate their effects in the transfer of linear photon momentum to the ionized electron by absorbing a sing... [Phys. Rev. A 98, 063413] Published Thu Dec 13, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Linear and nonlinear coherent coupling in a Bell-Bloom magnetometer (2018)

R. Gartman, V. Guarrera, G. Bevilacqua, and W. Chalupczak

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-14

Description: Author(s): R. Gartman, V. Guarrera, G. Bevilacqua, and W. Chalupczak Spin-exchange collisions in hot vapors are generally regarded as a decoherence mechanism. In contrast, we show that linear and nonlinear spin-exchange coupling can lead to the generation of atomic coherence in a Bell-Bloom magnetometer. In particular, we theoretically and experimentally demonstrate ... [Phys. Rev. A 98, 061401(R)] Published Thu Dec 13, 2018

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Guiding neutral particles endowed with a magnetic moment by an electromagnetic wave carrying orbital angular momentum: Quantum mechanics (2018)

Tomasz Radożycki

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-31

Description: Author(s): Tomasz Radożycki The quantum-mechanical states of neutral particles endowed with the magnetic moment (such as neutrons, light atoms, or even neutrinos, although the effect will be extremely tiny) in the combination of electromagnetic vortex field together with the constant magnetic field are investigated. It is show... [Phys. Rev. A 98, 013424] Published Mon Jul 30, 2018

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Intershell-correlation-induced time delay in atomic photoionization (2018)

D. A. Keating, S. T. Manson, V. K. Dolmatov, A. Mandal, P. C. Deshmukh, Faiza Naseem, and A. S. Kheifets

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-25

Description: Author(s): D. A. Keating, S. T. Manson, V. K. Dolmatov, A. Mandal, P. C. Deshmukh, Faiza Naseem, and A. S. Kheifets We predict an observable Wigner time delay in outer atomic shell photoionization near inner shell thresholds. The near-threshold increase of time delay is caused by intershell correlation and serves as a sensitive probe of this effect. The time delay increase is present even when the inner and outer... [Phys. Rev. A 98, 013420] Published Tue Jul 24, 2018

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Effective-potential theory for time-dependent many-electron wave functions (2018)

Tsuyoshi Kato and Kaoru Yamanouchi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-11

Description: Author(s): Tsuyoshi Kato and Kaoru Yamanouchi We derive a variation equation for a time-dependent effective potential that is local both in time and in space and show that this potential generates and propagates spin orbitals with which a many-particle, time-dependent, multiconfigurational wave function Ψ ( t ) is constructed. Within this approach... [Phys. Rev. A 98, 023405] Published Fri Aug 10, 2018

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Deflection of a molecular beam using the bichromatic stimulated force (2018)

S. E. Galica, L. Aldridge, D. J. McCarron, E. E. Eyler, and P. L. Gould

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): S. E. Galica, L. Aldridge, D. J. McCarron, E. E. Eyler, and P. L. Gould We demonstrate that a bichromatic standing-wave laser field can exert a significantly larger force on a molecule than ordinary radiation pressure. Our experiment measures the deflection of a pulsed supersonic beam of CaF molecules by a two-frequency laser field detuned symmetrically about resonance ... [Phys. Rev. A 98, 023408] Published Mon Aug 13, 2018

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Coulomb effect in laser-induced recollision excitation (2018)

T. Shaaran, K. Z. Hatsagortsyan, and C. H. Keitel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): T. Shaaran, K. Z. Hatsagortsyan, and C. H. Keitel Our investigation considers the amended strong-field approximation (SFA) ionization of rare-gas atoms in a strong laser field accompanied by excitation of the atom due to laser-induced recollision. This process can be viewed as inelastic above-threshold ionization and corresponds to the recollision-... [Phys. Rev. A 98, 023410] Published Mon Aug 13, 2018

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Above-threshold ionization by few-cycle Bessel pulses carrying orbital angular momentum (2018)

Birger Böning, Willi Paufler, and Stephan Fritzsche

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): Birger Böning, Willi Paufler, and Stephan Fritzsche We investigate theoretically the above-threshold ionization (ATI) of localized atomic targets by intense few-cycle Bessel pulses that carry orbital angular momentum (OAM), known also as twisted light. More specifically, we use the strong-field approximation (SFA) to compute the photoelectron energy ... [Phys. Rev. A 98, 023407] Published Mon Aug 13, 2018

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Time-dependent Hartree-Fock study of electron-hole interaction effects on high-order harmonic generation from periodic crystals (2018)

Takuya Ikemachi, Yasushi Shinohara, Takeshi Sato, Junji Yumoto, Makoto Kuwata-Gonokami, and Kenichi L. Ishikawa

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-18

Description: Author(s): Takuya Ikemachi, Yasushi Shinohara, Takeshi Sato, Junji Yumoto, Makoto Kuwata-Gonokami, and Kenichi L. Ishikawa We investigate the multielectron effects on high-order harmonic generation from solid-state materials using the time-dependent Hartree-Fock theory. We find qualitative change in harmonic spectra, in particular, multiple-plateau formation at significantly lower laser intensities than within the indep... [Phys. Rev. A 98, 023415] Published Fri Aug 17, 2018

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Weak-field asymptotic theory of tunneling ionization from nearly degenerate states (2018)

Pavel K. Samygin, Toru Morishita, and Oleg I. Tolstikhin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-05

Description: Author(s): Pavel K. Samygin, Toru Morishita, and Oleg I. Tolstikhin The weak-field asymptotic theory (WFAT) of tunneling ionization in a static electric field is limited by the assumption that tunneling occurs from an isolated state in a compact atomic or molecular system. In this paper, we generalize the WFAT in two directions: to the cases when tunneling ionizatio... [Phys. Rev. A 98, 033401] Published Tue Sep 04, 2018

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Stimulated-Raman-scattering-assisted superfluorescence enhancement from ionized nitrogen molecules in 800-nm femtosecond laser fields (2018)

Zhiming Miao, Xunqi Zhong, Linlin Zhang, Wei Zheng, Yunan Gao, Yunquan Liu, Hongbing Jiang, Qihuang Gong, and Chengyin Wu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-05

Description: Author(s): Zhiming Miao, Xunqi Zhong, Linlin Zhang, Wei Zheng, Yunan Gao, Yunquan Liu, Hongbing Jiang, Qihuang Gong, and Chengyin Wu We have observed collective spontaneous emission (superfluorescence) from ionized nitrogen molecules generated by 800-nm laser pulses. The superfluorescence intensity around 391 nm was found to be greatly enhanced when injecting an external seed with various wavelengths. Our finding provides insight... [Phys. Rev. A 98, 033402] Published Tue Sep 04, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Atomic-orbital-dependent photoelectron momentum distributions for ${\mathrm{F}}^{−}$ ions by orthogonal two-color laser fields (2018)

Jian-Hong Chen, Meng Han, Xiang-Ru Xiao, Liang-You Peng, and Yunquan Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-06

Description: Author(s): Jian-Hong Chen, Meng Han, Xiang-Ru Xiao, Liang-You Peng, and Yunquan Liu We theoretically investigate the two-dimensional photoelectron momentum distributions (PMDs) of F − ions in an orthogonal two-color laser field with equal intensities. The PMDs for different atomic orbitals are simulated by an exact solution to the three-dimensional time-dependent Schrödinger equatio... [Phys. Rev. A 98, 033403] Published Wed Sep 05, 2018

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Core-resonant ionization of helium by intense XUV pulses: Analytical and numerical studies on channel-resolved spectral features (2018)

Chuan Yu and Lars Bojer Madsen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-07

Description: Author(s): Chuan Yu and Lars Bojer Madsen Channel-resolved ionization of helium by laser pulses with a photon energy equal to the energy difference between the ionic ground- and first-excited states, i.e., in the core-resonant scenario, is investigated theoretically for a considered peak intensity of ∼ 10 14 W/ cm 2 . By using the essential-stat... [Phys. Rev. A 98, 033404] Published Thu Sep 06, 2018

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Multistage Zeeman deceleration of atomic and molecular oxygen (2018)

Theo Cremers, Simon Chefdeville, Vikram Plomp, Niek Janssen, Edwin Sweers, and Sebastiaan Y. T. van de Meerakker

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-07

Description: Author(s): Theo Cremers, Simon Chefdeville, Vikram Plomp, Niek Janssen, Edwin Sweers, and Sebastiaan Y. T. van de Meerakker Multistage Zeeman deceleration is a technique used to reduce the velocity of neutral molecules with a magnetic-dipole moment. Here we present a Zeeman decelerator that consists of 100 solenoids and 100 magnetic hexapoles that is based on a short prototype design presented recently [ Phys. Rev. A 95 , ... [Phys. Rev. A 98, 033406] Published Thu Sep 06, 2018

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Partial cross sections and interfering resonances in photoionization of molecular nitrogen (2018)

Markus Klinker, Carlos Marante, Luca Argenti, Jesús González-Vázquez, and Fernando Martín

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-19

Description: Author(s): Markus Klinker, Carlos Marante, Luca Argenti, Jesús González-Vázquez, and Fernando Martín We present an in-depth theoretical study of N 2 photoionization in the region between the second ( 2 Π u ) and third ( 2 Σ u + ) ionization thresholds. In this region, the electronic continuum includes the Hopfield series of autoionizing states, corresponding to excitations to n s σ d , n d σ d , and n d π g molecular o... [Phys. Rev. A 98, 033413] Published Tue Sep 18, 2018

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Photoionization of metastable heliumlike ${\mathrm{C}}^{4+}(1s2s\phantom{\rule{0.16em}{0ex}}^{3}S_{1})$ ions: Precision study of intermediate doubly excited states (2018)

A. Müller, E. Lindroth, S. Bari, A. Borovik, Jr., P.-M. Hillenbrand, K. Holste, P. Indelicato, A. L. D. Kilcoyne, S. Klumpp, M. Martins, J. Viefhaus, P. Wilhelm, and S. Schippers

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-26

Description: Author(s): A. Müller, E. Lindroth, S. Bari, A. Borovik, Jr., P.-M. Hillenbrand, K. Holste, P. Indelicato, A. L. D. Kilcoyne, S. Klumpp, M. Martins, J. Viefhaus, P. Wilhelm, and S. Schippers In a joint experimental and theoretical endeavor, photoionization of metastable C 4 + ( 1 s 2 s S 1 3 ) ions via intermediate levels with hollow, double- K -vacancy configurations 2 s 2 p , 2 s 3 p , 2 p 3 s , 2 p 3 d , 2 s 4 p , 2 p 4 s , and 2 p 4 d has been investigated. High-resolution photon-ion merged-beams measurements were carried... [Phys. Rev. A 98, 033416] Published Tue Sep 25, 2018

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Strong-field photoionization in two-center atomic systems (2018)

J. Fedyk, A. B. Voitkiv, and C. Müller

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-28

Description: Author(s): J. Fedyk, A. B. Voitkiv, and C. Müller Photoionization of an atom A by a strong laser field in the presence of a spatially well-separated neighboring atom B is considered. The laser field frequency is assumed to lie below the ionization potential of atom A and be resonant with a dipole-allowed transition in atom B . In this situation, the... [Phys. Rev. A 98, 033418] Published Thu Sep 27, 2018

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$\mathrm{Λ}$-enhanced gray-molasses cooling of cesium atoms on the ${D}_{2}$ line (2018)

Ya-Fen Hsiao, Yu-Ju Lin, and Ying-Cheng Chen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-29

Description: Author(s): Ya-Fen Hsiao, Yu-Ju Lin, and Ying-Cheng Chen We present a systematic study of the Λ -enhanced gray molasses cooling ( Λ -GMC) of cesium atoms on the D 2 transition. Due to the large splitting in the excited hyperfine transitions of the cesium D 2 line, it is relatively simple to implement the Λ -GMC with a suitable frequency control of the trapping ... [Phys. Rev. A 98, 033419] Published Fri Sep 28, 2018

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Selectivity of the Br $3{d}^{−1}$ Auger decays in HBr (2018)

J. Palaudoux, T. Kaneyasu, L. Andric, S. Carniato, G. Gamblin, F. Penent, Y. Hikosaka, E. Shigemasa, K. Ito, S. Fritzsche, E. Kukk, S. Sheinerman, R. F. Fink, P. Lablanquie, and R. Püttner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-04

Description: Author(s): J. Palaudoux, T. Kaneyasu, L. Andric, S. Carniato, G. Gamblin, F. Penent, Y. Hikosaka, E. Shigemasa, K. Ito, S. Fritzsche, E. Kukk, S. Sheinerman, R. F. Fink, P. Lablanquie, and R. Püttner The Auger decay of the spin-orbit and molecular-field split Br 3 d − 1 core holes in HBr is investigated, both by a photoelectron–Auger-electron coincidence experiment and by ab initio calculations based on the one-center approximation. The branching ratios for the Auger decay of the five different cor... [Phys. Rev. A 98, 043406] Published Wed Oct 03, 2018

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Field ionization in short and extremely intense laser pulses (2018)

I. Yu. Kostyukov and A. A. Golovanov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-05

Description: Author(s): I. Yu. Kostyukov and A. A. Golovanov Modern laser systems are able to generate short and intense laser pulses ionizing matter in the poorly explored barrier-suppression regime. Field ionization in this regime is studied analytically and numerically. For analytical studies, both the classical and the quantum approaches are used. Two app... [Phys. Rev. A 98, 043407] Published Thu Oct 04, 2018

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Generation of ultrafast magnetic fields from molecular coherent electron currents (2018)

Kai-Jun Yuan, Jing Guo, and André D. Bandrauk

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-06

Description: Author(s): Kai-Jun Yuan, Jing Guo, and André D. Bandrauk Coherent electron currents in circular charge transport are of great importance in photoinduced processes, magneto-optics, and reaction dynamics of molecules. We present ultrafast magnetic field generation by circularly polarized attosecond ultraviolet laser pulses in molecular media. Simulations in... [Phys. Rev. A 98, 043410] Published Fri Oct 05, 2018

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Screening of an oscillating external electric field in atoms (2018)

V. A. Dzuba, J. C. Berengut, J. S. M. Ginges, and V. V. Flambaum

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-06

Description: Author(s): V. A. Dzuba, J. C. Berengut, J. S. M. Ginges, and V. V. Flambaum We study the screening of a homogeneous oscillating external electric field E 0 in noble-gas atoms using atomic many-body calculations. At zero frequency of the oscillations ( ω = 0 ) the screened field E ( r ) vanishes at the nucleus, E ( 0 ) = 0 . However, the profile of the field E ( r ) is complicated, with the ... [Phys. Rev. A 98, 043411] Published Fri Oct 05, 2018

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Control of molecular dissociation by spatially inhomogeneous near fields (2018)

I. Yavuz, J. Schötz, M. F. Ciappina, P. Rosenberger, Z. Altun, M. Lewenstein, and M. F. Kling

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-09

Description: Author(s): I. Yavuz, J. Schötz, M. F. Ciappina, P. Rosenberger, Z. Altun, M. Lewenstein, and M. F. Kling Tailored intense laser fields can be used to steer electron and nuclear dynamics in molecules and control chemical reactions. Here we demonstrate that inhomogeneous nanoscopic near fields provide an additional mechanism for controlling light-induced chemical reactions. This is investigated by quantu... [Phys. Rev. A 98, 043413] Published Mon Oct 08, 2018

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Preparation of circular Rydberg states in helium with $n≥70$ using a modified version of the crossed-fields method (2018)

A. A. Morgan, V. Zhelyazkova, and S. D. Hogan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-11

Description: Author(s): A. A. Morgan, V. Zhelyazkova, and S. D. Hogan Circular Rydberg states with n = 70 have been prepared in helium using a modified version of the crossed-fields method. This approach to the preparation of high- n circular Rydberg states overcomes limitations of the standard crossed-fields method which arise at this, and higher, values of n . The exper... [Phys. Rev. A 98, 043416] Published Wed Oct 10, 2018

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Strong-field polarizability-enhanced dissociative ionization (2018)

Lun Yue, Philipp Wustelt, A. Max Sayler, Florian Oppermann, Manfred Lein, Gerhard G. Paulus, and Stefanie Gräfe

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-16

Description: Author(s): Lun Yue, Philipp Wustelt, A. Max Sayler, Florian Oppermann, Manfred Lein, Gerhard G. Paulus, and Stefanie Gräfe We investigate dissociative single and double ionization of HeH + induced by intense femtosecond laser pulses. By employing a semiclassical model with nuclear trajectories moving on field-dressed surfaces and ionization events treated as stochastical jumps, we identify a strong-field mechanism wherei... [Phys. Rev. A 98, 043418] Published Mon Oct 15, 2018

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Thermal-average effects on photoassociation with a slowly-turned-on and rapidly-turned-off laser pulse (2018)

Yong-Chang Han, Jin-Wei Hu, and Bin-Bin Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-16

Description: Author(s): Yong-Chang Han, Jin-Wei Hu, and Bin-Bin Wang We investigate theoretically the photoassociation (PA) of two Cs atoms using a slowly-turned-on and rapidly-turned-off (STRT) laser pulse at the temperature of 54 μ K by taking the thermal average of the initial continuum states into account. For comparison, the PA probabilities under the action of th... [Phys. Rev. A 98, 043420] Published Mon Oct 15, 2018

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Cooper minimum in singly ionized and neutral argon (2018)

O. Hassouneh, N. B. Tyndall, J. Wragg, H. W. van der Hart, and A. C. Brown

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-16

Description: Author(s): O. Hassouneh, N. B. Tyndall, J. Wragg, H. W. van der Hart, and A. C. Brown We present an analysis of the appearance of the Cooper minimum in singly ionized argon in both the photoionization cross-section (PICS) and high-harmonic generation (HHG) spectrum. We employ two computational approaches based on the same R -matrix technique to provide a coherent description of the at... [Phys. Rev. A 98, 043419] Published Mon Oct 15, 2018

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Time-optimal selective pulses of two uncoupled spin-1/2 particles (2018)

L. Van Damme, Q. Ansel, S. J. Glaser, and D. Sugny

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-17

Description: Author(s): L. Van Damme, Q. Ansel, S. J. Glaser, and D. Sugny We investigate the time-optimal solution of the selective control of two uncoupled spin 1/2 particles. Using the Pontryagin maximum principle, we derive the global time-optimal pulses for two spins with different offsets. We show that the Pontryagin Hamiltonian can be written as a one-dimensional ef... [Phys. Rev. A 98, 043421] Published Tue Oct 16, 2018

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Separating intracycle interferences in photoelectron momentum distributions by a polarization-gated pulse (2018)

Yan; Lan Wang, Shao; Gang Yu, Xuan; Yang Lai, Hui; Peng Kang, Song; Po Xu, Ren; Ping Sun, Wei Quan, and Xiao; Jun Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-17

Description: Author(s): YanLan Wang, ShaoGang Yu, XuanYang Lai, HuiPeng Kang, SongPo Xu, RenPing Sun, Wei Quan, and XiaoJun Liu We theoretically demonstrate the feasibility of separation of various of intracycle interferences in photoelectron momentum distributions (PMDs) with a polarization-gated (PG) pulse constructed by a left-circularly polarized and a time-delayed right-circularly polarized few-cycle laser pulse. By num... [Phys. Rev. A 98, 043422] Published Tue Oct 16, 2018

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Enhanced pair creation by an oscillating potential with multiple well-barrier structures in space (2018)

C. Gong, Z. L. Li, and Y. J. Li

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-17

Description: Author(s): C. Gong, Z. L. Li, and Y. J. Li Electron-positron pair creation from a vacuum in an oscillating potential with multiple well-barrier structures is investigated by the computational quantum field theory. For the potential with a well-barrier structure, it is found that when the distance between the well and barrier is large, the pa... [Phys. Rev. A 98, 043424] Published Tue Oct 16, 2018

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Continuous production of rovibronic-ground-state RbCs molecules via short-range photoassociation to the $b^{3}\mathrm{Π}_{1}–c^{3}\mathrm{Σ}_{1}^{+}–B^{1}\mathrm{Π}_{1}$ states (2018)

Toshihiko Shimasaki, Jin-Tae Kim, Yuqi Zhu, and David De; Mille

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-17

Description: Author(s): Toshihiko Shimasaki, Jin-Tae Kim, Yuqi Zhu, and David DeMille Rovibronic levels of the mixed b 3 Π 1 - c 3 Σ 1 + - B 1 Π 1 states of RbCs molecules are experimentally investigated with photoassociation, where the strong singlet-triplet mixing in the states facilitates a rate of 10 4 s − 1 for producing rovibronic ground-state molecules. [Phys. Rev. A 98, 043423] Published Tue Oct 16, 2018

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Canonical tunneling time in ionization experiments (2018)

Bekir Baytaş, Martin Bojowald, and Sean Crowe

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-18

Description: Author(s): Bekir Baytaş, Martin Bojowald, and Sean Crowe Canonical semiclassical methods can be used to develop an intuitive definition of tunneling time through potential barriers. An application to atomic ionization is given here, considering both static and time-dependent electric fields. The results allow one to analyze different theoretical construct... [Phys. Rev. A 98, 063417] Published Mon Dec 17, 2018

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Wavelength dependence of high-order harmonic yields in solids (2018)

Xi Liu, Liang Li, Xiaosong Zhu, Tengfei Huang, Xiaofan Zhang, Dian Wang, Pengfei Lan, and Peixiang Lu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-19

Description: Author(s): Xi Liu, Liang Li, Xiaosong Zhu, Tengfei Huang, Xiaofan Zhang, Dian Wang, Pengfei Lan, and Peixiang Lu We theoretically investigate the wavelength dependence of high-order harmonic yields in solids driven by a mid-infrared laser field. By solving the three-dimensional two-band density matrix equations in the wavelength range of 2.0 – 7.5 μ m , it is shown that, in the limit of slow dephasing (dephasing ti... [Phys. Rev. A 98, 063419] Published Tue Dec 18, 2018

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Two-center interference effect in ionization of diatomic molecules subject to close-to-circularly-polarized femtosecond laser fields (2018)

Ming; Zheng Wei, Wei Quan, Ren; Ping Sun, Song; Po Xu, Zhi; Lei Xiao, Yu Zhou, Meng Zhao, Xiao; Lei Hao, Chuan; Xi Duan, and Xiao; Jun Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-19

Description: Author(s): MingZheng Wei, Wei Quan, RenPing Sun, SongPo Xu, ZhiLei Xiao, Yu Zhou, Meng Zhao, XiaoLei Hao, ChuanXi Duan, and XiaoJun Liu Experimentally and theoretically, we explore the photoelectron momentum distributions of N 2 and O 2 and their companion atoms Ar and Xe, which possess nearly equal electron binding energies to the corresponding molecules, subject to close-to-circularly polarized laser fields. Compared to Xe, signific... [Phys. Rev. A 98, 063418] Published Tue Dec 18, 2018

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Infrared-laser-pulse-enhanced ultrafast fragmentation of ${{\mathrm{N}}_{2}}^{2+}$ following Auger decay: Mixed quantum-classical simulations (2018)

Murali Krishna Ganesa Subramanian, Robin Santra, and Ralph Welsch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-20

Description: Author(s): Murali Krishna Ganesa Subramanian, Robin Santra, and Ralph Welsch We employ mixed quantum-classical molecular dynamics simulations to investigate the fragmentation of N 2 molecules after core-level photoionization by an x-ray laser, subsequent Auger decay, and followed by a femtosecond IR pulse that interacts with N 2 2 + . The delayed IR pulse couples the dissociative... [Phys. Rev. A 98, 063421] Published Wed Dec 19, 2018

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Spatiotemporal imaging of plasmonic fields near nanoparticles below the diffraction limit (2018)

Erfan Saydanzad, Jianxiong Li, and Uwe Thumm

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-20

Description: Author(s): Erfan Saydanzad, Jianxiong Li, and Uwe Thumm Optically induced collective conduction-electron oscillations can generate intense plasmonic fields near metallic nanoparticles. We suggest a method for reconstructing such nanoplasmonic fields with nanometer spatial and sub-femtosecond temporal resolution from streaked photoemission spectra. Applyi... [Phys. Rev. A 98, 063422] Published Wed Dec 19, 2018

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Treating branch cuts in quantum trajectory models for photoelectron holography (2018)

A. S. Maxwell, S. V. Popruzhenko, and C. Figueira de Morisson Faria

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-21

Description: Author(s): A. S. Maxwell, S. V. Popruzhenko, and C. Figueira de Morisson Faria Most implementations of Coulomb-distorted strong-field approaches that contain features such as tunneling and quantum interference use real trajectories in continuum propagation, while a fully consistent approach must use complex trajectories throughout. A key difficulty in the latter case are singu... [Phys. Rev. A 98, 063423] Published Thu Dec 20, 2018

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Resonant inelastic scattering of two x-ray photons by a many-electron atom (2018)

Alexey N. Hopersky, Alexey M. Nadolinsky, and Sergey A. Novikov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-21

Description: Author(s): Alexey N. Hopersky, Alexey M. Nadolinsky, and Sergey A. Novikov A nonrelativistic variant of the quantum theory for the resonant inelastic-scattering process of two x-ray photons in the deep 1 s -shell ionization threshold energy region of a free many-electron atom is established. A quantitative estimate for the magnitude of the observed differential cross section... [Phys. Rev. A 98, 063424] Published Thu Dec 20, 2018

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Counterion-controlled spectral tuning of the protonated Schiff-base retinal (2018)

Yoni Toker, Jeppe Langeland, Elisabeth Gruber, Christina Kjær, Steen Brøndsted Nielsen, Lars H. Andersen, Veniamin A. Borin, and Igor Schapiro

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-24

Description: Author(s): Yoni Toker, Jeppe Langeland, Elisabeth Gruber, Christina Kjær, Steen Brøndsted Nielsen, Lars H. Andersen, Veniamin A. Borin, and Igor Schapiro Color vision is based on the ability of different opsin proteins to tune the absorption band of their chromophore, the retinal protonated Schiff base (RPSB). Two main mechanisms proposed for this tunability are geometric and electrostatic. Here we probe the latter effect experimentally and by a quan... [Phys. Rev. A 98, 043428] Published Tue Oct 23, 2018

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Characteristics of unconventional Rb magneto-optical traps (2018)

K. N. Jarvis, B. E. Sauer, and M. R. Tarbutt

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-26

Description: Author(s): K. N. Jarvis, B. E. Sauer, and M. R. Tarbutt We study several magneto-optical trapping configurations in Rb 87 . These unconventional MOTs all use type-II transitions, where the angular momentum of the ground state is greater than or equal to that of the excited state. Some use red-detuned light, and others blue-detuned light. The properties of ... [Phys. Rev. A 98, 043432] Published Thu Oct 25, 2018

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Angular momentum distribution in Rydberg states excited by a strong laser pulse (2018)

J. Venzke, R. Reiff, Z. Xue, A. Jaroń-Becker, and A. Becker

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-31

Description: Author(s): J. Venzke, R. Reiff, Z. Xue, A. Jaroń-Becker, and A. Becker We study the excitation to Rydberg states in the interaction of the hydrogen atom with a short, strong laser pulse. Utilizing solutions of the time-dependent Schrödinger equation we find that the parity of the populated angular momentum states agrees with the selection rules for multiphoton resonant... [Phys. Rev. A 98, 043434] Published Tue Oct 30, 2018

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Fast adiabatic evolution by oscillating initial Hamiltonians (2018)

Francesco Petiziol, Benjamin Dive, Florian Mintert, and Sandro Wimberger

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-01

Description: Author(s): Francesco Petiziol, Benjamin Dive, Florian Mintert, and Sandro Wimberger We propose a method to produce fast transitionless dynamics for finite-dimensional quantum systems without requiring additional Hamiltonian components not included in the initial control setup, remaining close to the true adiabatic path at all times. The strategy is based on the introduction of an e... [Phys. Rev. A 98, 043436] Published Wed Oct 31, 2018

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Control of the helicity of high-order harmonic radiation using bichromatic circularly polarized laser fields (2018)

Gopal Dixit, Álvaro Jiménez-Galán, Lukas Medišauskas, and Misha Ivanov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-06

Description: Author(s): Gopal Dixit, Álvaro Jiménez-Galán, Lukas Medišauskas, and Misha Ivanov High-order harmonic generation in two-color ( ω − 2 ω ) counter-rotating circularly polarized laser fields opens the path to generate isolated attosecond pulses and attosecond pulse trains with controlled ellipticity. The generated harmonics have alternating helicity, and the ellipticity of the generated... [Phys. Rev. A 98, 053402] Published Mon Nov 05, 2018

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Attosecond transient-absorption spectroscopy of polar molecules (2018)

Jørgen Johansen Rørstad, Nikolaj S. W. Ravn, Lun Yue, and Lars Bojer Madsen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-06

Description: Author(s): Jørgen Johansen Rørstad, Nikolaj S. W. Ravn, Lun Yue, and Lars Bojer Madsen We apply attosecond transient absorption spectroscopy (ATAS) to explore the effects of a nonzero permanent dipole on electron dynamics at the subfemtosecond scale, exemplified in the polar LiF molecule. In contrast with nonpolar systems, a familiar feature of the ATA spectra—the light-induced struct... [Phys. Rev. A 98, 053401] Published Mon Nov 05, 2018

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Reconstruction of the complex angle-dependent photoionization transition dipole from a laser-dressed streaking experiment (2018)

Xi Zhao, Hui Wei, Wei-Wei Yu, and C. D. Lin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-07

Description: Author(s): Xi Zhao, Hui Wei, Wei-Wei Yu, and C. D. Lin We study the retrieval of the angular dependence of the photoionization transition dipole phase of an attosecond XUV pulse in order to reconstruct the whole photoelectron wave packet after the photoemission process. Using a one-electron model Ar atom, we show that the full electron wave packet can b... [Phys. Rev. A 98, 053404] Published Tue Nov 06, 2018

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Boosting terahertz-radiation power with two-color circularly polarized midinfrared laser pulses (2018)

V. A. Tulsky, M. Baghery, U. Saalmann, and S. V. Popruzhenko

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-15

Description: Author(s): V. A. Tulsky, M. Baghery, U. Saalmann, and S. V. Popruzhenko A way to considerably enhance terahertz radiation, emitted in the interaction of intense midinfrared laser pulses with atomic gases, in both the total energy and the electric-field amplitude is suggested. The scheme is based on the application of a two-color field consisting of a strong circularly p... [Phys. Rev. A 98, 053415] Published Wed Nov 14, 2018

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Strong-field- versus weak-field-ionization pump-probe spectroscopy (2018)

Spencer L. Horton, Yusong Liu, Pratip Chakraborty, Philipp Marquetand, Tamás Rozgonyi, Spiridoula Matsika, and Thomas Weinacht

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-15

Description: Author(s): Spencer L. Horton, Yusong Liu, Pratip Chakraborty, Philipp Marquetand, Tamás Rozgonyi, Spiridoula Matsika, and Thomas Weinacht Ionization can serve as a universal probe of excited-state dynamics in molecules, such as internal conversion, dissociation, and isomerization. These processes are of fundamental importance to a wide array of dynamics in biology, chemistry, and physics. In recent years, there has been significant de... [Phys. Rev. A 98, 053416] Published Wed Nov 14, 2018

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State-selective electric-field ionization of Rydberg positronium (2018)

A. M. Alonso, L. Gurung, B. A. D. Sukra, S. D. Hogan, and D. B. Cassidy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): A. M. Alonso, L. Gurung, B. A. D. Sukra, S. D. Hogan, and D. B. Cassidy We report experiments in which positronium (Ps) atoms, optically excited to Rydberg states with principal quantum numbers n in the range 18–25, were selectively ionized by both static and pulsed electric fields. The experiments were modeled using Monte Carlo simulations that include tunnel ionizatio... [Phys. Rev. A 98, 053417] Published Thu Nov 15, 2018

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Coulomb potential effects in strong-field atomic ionization under elliptical polarization (2018)

Ren; Ping Sun, Xuan; Yang Lai, Wei Quan, Shao; Gang Yu, Yan; Lan Wang, Song; Po Xu, Zhi; Lei Xiao, Yu Zhou, Ming; Zheng Wei, Meng Zhao, and Xiao; Jun Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): RenPing Sun, XuanYang Lai, Wei Quan, ShaoGang Yu, YanLan Wang, SongPo Xu, ZhiLei Xiao, Yu Zhou, MingZheng Wei, Meng Zhao, and XiaoJun Liu We experimentally and theoretically investigate strong-field ionization of noble-gas atoms in elliptically polarized laser fields at 2000 nm. The ellipticity dependence of the ion yields has been measured at a series of intensities and compared to various theoretical model predictions [i.e., the Amm... [Phys. Rev. A 98, 053418] Published Thu Nov 15, 2018

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Photodetachment of the ${\mathrm{H}}^{−}$ ion in a quantum well with one expanding wall (2018)

De-hua Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): De-hua Wang The standard closed orbit theory is extended to investigate the photodetachment of a negative ion near a moving wall. The photodetachment cross section of the H − ion in a quantum well with one expanding wall is specifically put forward. In contrast to the photodetachment of the negative ion in a sta... [Phys. Rev. A 98, 053419] Published Thu Nov 15, 2018

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Attospin and channel closings in high-order above-threshold ionization by bicircular laser fields (2018)

D. B. Milošević

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): D. B. Milošević In Phys. Rev. A 93 , 051402(R) (2016) , we proposed a method to introduce spin into attoscience with spin-polarized electrons produced by a bicircular laser field. In the present paper we further develop this method. We calculate focal-averaged photoelectron spectra and the corresponding spin asymmetr... [Phys. Rev. A 98, 053420] Published Thu Nov 15, 2018

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Effect of multiorbital contributions to strong-field ionization of benzene derivatives (2018)

Eldad Yahel and Amir Natan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): Eldad Yahel and Amir Natan Strong-field ionization of benzene, fluorobenzene, benzonitrile, and 1-chloro-2-fluorobenzene is studied within the framework of real-space and real-time time-dependent density functional theory. Analysis of the ionization rates as a function of the molecule orientation reveals a significant contrib... [Phys. Rev. A 98, 053421] Published Thu Nov 15, 2018

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Collisional cooling of internal rotation in ${\mathrm{MgH}}^{+}$ ions trapped with He atoms: Quantum modeling meets experiments in Coulomb crystals (2018)

L. González-Sánchez, R. Wester, and F. A. Gianturco

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): L. González-Sánchez, R. Wester, and F. A. Gianturco Using the ab initio computed potential energy surface for the electronic interaction of the MgH + ( Σ 1 ) ion with the He( S 1 ) atom, we calculate the relevant state-changing rotationally inelastic collision cross sections from a quantum treatment of the multichannel scattering problem. We focus on the qua... [Phys. Rev. A 98, 053423] Published Thu Nov 15, 2018

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Control of Rydberg-state population with realistic femtosecond laser pulses (2018)

Janne Solanpää and Esa Räsänen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-16

Description: Author(s): Janne Solanpää and Esa Räsänen We investigate computationally a method for ultrafast preparation of alkali-metal atoms in their Rydberg states using a three-dimensional model potential in the single active electron approximation. By optimizing laser pulse shapes that can be generated with modern waveform synthesizers, we propose ... [Phys. Rev. A 98, 053422] Published Thu Nov 15, 2018

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High-order harmonic generation with controllable temporal coherence generated from a coherently excited medium (2018)

Itai Hadas, Liran Hareli, and Alon Bahabad

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-17

Description: Author(s): Itai Hadas, Liran Hareli, and Alon Bahabad High harmonic generation has been considered for many years to be a coherent source of upconverted laser radiation. We propose a method for the generation of essentially incoherent high harmonic generation with a controlled degree of temporal coherence, obeying random-walk statistics. This is achiev... [Phys. Rev. A 98, 053425] Published Fri Nov 16, 2018

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Non-Markovian dynamics of the electronic subsystem in a laser-driven molecule: Characterization and connections with electronic-vibrational entanglement and electronic coherence (2018)

Mihaela Vatasescu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-20

Description: Author(s): Mihaela Vatasescu Non-Markovian quantum evolution of the electronic subsystem in a laser-driven molecule is characterized through the appearance of negative decoherence rates in the canonical form of the electronic master equation. For a driven molecular system described in a bipartite Hilbert space H = H e l ⨂ H vib of dim... [Phys. Rev. A 98, 053426] Published Mon Nov 19, 2018

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Dynamics of electrons in plasmonic excitation of ring-shaped Na clusters (2018)

Kiyohiko Someda and Tomokazu Yasuike

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): Kiyohiko Someda and Tomokazu Yasuike Motion of electrons in plasmonic excitation of ring-shaped clusters Na 4 n + 2 ( n = 1 , 2 , ... , 5 ) is analyzed by inspecting trajectories of the Thouless parameters which describe photoexcitation to the plasmonic-excited state. We examine the Floquet state produced by irradiation of stationary light inducing t... [Phys. Rev. A 98, 053436] Published Tue Nov 27, 2018

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$R$-matrix-with-time-dependence theory for ultrafast atomic processes in arbitrary light fields (2018)

D. D. A. Clarke, G. S. J. Armstrong, A. C. Brown, and H. W. van der Hart

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-30

Description: Author(s): D. D. A. Clarke, G. S. J. Armstrong, A. C. Brown, and H. W. van der Hart We describe an ab initio and nonperturbative R -matrix with time-dependence theory for ultrafast atomic processes in light fields of arbitrary polarization. The theory is applicable to complex, multielectron atoms and atomic ions subject to ultrashort (particularly few-femtosecond and attosecond) las... [Phys. Rev. A 98, 053442] Published Thu Nov 29, 2018

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Photoionization cross sections of the $5{S}_{1/2}$ and $5{P}_{3/2}$ states of Rb in simultaneous magneto-optical trapping of Rb and Hg (2018)

M. Witkowski, R. Munoz-Rodriguez, A. Raczyński, J. Zaremba, B. Nagórny, P. S. Żuchowski, R. Ciuryło, and M. Zawada

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-30

Description: Author(s): M. Witkowski, R. Munoz-Rodriguez, A. Raczyński, J. Zaremba, B. Nagórny, P. S. Żuchowski, R. Ciuryło, and M. Zawada We report the measurement of the photoionization cross sections of the 5 S 1 / 2 and 5 P 3 / 2 states of Rb 87 in a two-species Hg and Rb magneto-optical trap (MOT) by the cooling laser for Hg. The photoionization cross sections of Rb in the 5 S 1 / 2 and 5 P 3 / 2 states at 253.7 nm are determined to be 1 − 1 + 4.3 × 10 − ... [Phys. Rev. A 98, 053444] Published Thu Nov 29, 2018

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Ultrafast nuclear dynamics in the doubly-core-ionized water molecule observed via Auger spectroscopy (2018)

T. Marchenko, L. Inhester, G. Goldsztejn, O. Travnikova, L. Journel, R. Guillemin, I. Ismail, D. Koulentianos, D. Céolin, R. Püttner, M. N. Piancastelli, and M. Simon

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-04

Description: Author(s): T. Marchenko, L. Inhester, G. Goldsztejn, O. Travnikova, L. Journel, R. Guillemin, I. Ismail, D. Koulentianos, D. Céolin, R. Püttner, M. N. Piancastelli, and M. Simon We present a combined experimental and theoretical study of the Auger-emission spectrum following double core ionization and excitation of gas-phase water molecules with hard-x-ray synchrotron radiation above the O K − 2 threshold. We observe an indication of ultrafast proton motion occurring within t... [Phys. Rev. A 98, 063403] Published Mon Dec 03, 2018

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Real single-loop cyclic three-level configuration of chiral molecules (2018)

Chong Ye, Quansheng Zhang, and Yong Li

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-04

Description: Author(s): Chong Ye, Quansheng Zhang, and Yong Li Single-loop cyclic three-level ( Δ -type) configuration of chiral molecules was used for enantio-separation in many theoretical works. Considering the effect of molecular rotation, this simple single-loop configuration is generally replaced by a complicated multiple-loop configuration containing multi... [Phys. Rev. A 98, 063401] Published Mon Dec 03, 2018

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Central frequency of few-cycle laser pulses in strong-field processes (2018)

J. Venzke, T. Joyce, Z. Xue, A. Becker, and A. Jaron-Becker

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-11

Description: Author(s): J. Venzke, T. Joyce, Z. Xue, A. Becker, and A. Jaron-Becker We analyze the role of the difference between the central frequencies of the spectral distributions of the vector potential and the electric field of a short laser pulse. The frequency shift arises when the electric field is determined as the derivative of the vector potential to ensure that both qu... [Phys. Rev. A 98, 063409] Published Mon Dec 10, 2018

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Optical absorption properties of laser-driven matter (2018)

Bing Gu and Ignacio Franco

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-13

Description: Author(s): Bing Gu and Ignacio Franco Characterizing and controlling matter driven far from equilibrium represents a major challenge for science and technology. Here, we develop a theory for the optical absorption of electronic materials driven far from equilibrium by resonant and nonresonant lasers. In it, the interaction between matte... [Phys. Rev. A 98, 063412] Published Wed Dec 12, 2018

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Laser cooling and magneto-optical trapping of molecules analyzed using optical Bloch equations and the Fokker-Planck-Kramers equation (2018)

J. A. Devlin and M. R. Tarbutt

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-14

Description: Author(s): J. A. Devlin and M. R. Tarbutt We study theoretically the behavior of laser-cooled calcium monofluoride (CaF) molecules in an optical molasses and magneto-optical trap (MOT), and compare our results to recent experiments. We use multilevel optical Bloch equations to estimate the force and the diffusion constant, followed by a Fok... [Phys. Rev. A 98, 063415] Published Thu Dec 13, 2018

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Subcycle interference in high-order harmonic generation from solids (2018)

Tao-Yuan Du, Dong Tang, and Xue-Bin Bian

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-15

Description: Author(s): Tao-Yuan Du, Dong Tang, and Xue-Bin Bian Different from the high-order harmonic generation (HHG) from gases, we find that the yield of HHG from solids exhibits unexpected modulations as a function of the driving laser intensity and wavelength. Its mechanism can be unraveled by the interference between currents inside the solids induced by ... [Phys. Rev. A 98, 063416] Published Fri Dec 14, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Nuclear-spin-polarization dynamics of ${\mathrm{H}}_{2}$, ${\mathrm{D}}_{2}$, and HD molecules in magnetic fields (2018)

C. S. Kannis, G. E. Katsoprinakis, D. Sofikitis, and T. P. Rakitzis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-19

Description: Author(s): C. S. Kannis, G. E. Katsoprinakis, D. Sofikitis, and T. P. Rakitzis We study the polarization dynamics of the molecular rotation and the nuclear spin in the presence of magnetic fields, in the hydrogen isotope molecules, H 2 , D 2 , and HD. If only the rotational or the nuclear angular momentum is polarized, polarization is transferred from one to the other and back in a... [Phys. Rev. A 98, 043426] Published Thu Oct 18, 2018

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Photoionization of Xe and $\mathrm{Xe}@{\mathrm{C}}_{60}$ from the $4d$ shell in RABBITT fields (2018)

Alexander W. Bray, Faiza Naseem, and Anatoli S. Kheifets

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-19

Description: Author(s): Alexander W. Bray, Faiza Naseem, and Anatoli S. Kheifets We consider photoemission from the 4 d shell of the free Xe and encapsulated Xe@ C 60 atoms by ionizing XUV and probing IR fields typical for a RABBITT (reconstruction of attosecond beating by interference of two-photon transitions) measurement. Our theoretical model is based on the numerical solution ... [Phys. Rev. A 98, 043427] Published Thu Oct 18, 2018

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Heating and cooling of electrons in an ultracold neutral plasma using Rydberg atoms (2018)

E. V. Crockett, R. C. Newell, F. Robicheaux, and D. A. Tate

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-25

Description: Author(s): E. V. Crockett, R. C. Newell, F. Robicheaux, and D. A. Tate We have experimentally demonstrated both heating and cooling of electrons in an ultracold neutral plasma (UNP) by embedding Rydberg atoms into the plasma soon after its creation. We have determined the relationship between the initial electron temperature, T e , i , and the binding energy of the added R... [Phys. Rev. A 98, 043431] Published Wed Oct 24, 2018

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Efficient calculation of Rayleigh and Raman scattering (2018)

K. McNamara, D. V. Fursa, and I. Bray

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-10-31

Description: Author(s): K. McNamara, D. V. Fursa, and I. Bray We present two methods for computing the Rayleigh and Raman scattering cross sections for photon scattering on atomic hydrogen or hydrogenlike systems. Both methods are applicable for incident photon energies above the ionization threshold. The first method implements the well-known Gaussian quadrat... [Phys. Rev. A 98, 043435] Published Tue Oct 30, 2018

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Ionization dynamics through a Fano resonance: Time-domain interpretation of spectral amplitudes (2018)

Antoine Desrier, Alfred Maquet, Richard Taïeb, and Jérémie Caillat

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-08

Description: Author(s): Antoine Desrier, Alfred Maquet, Richard Taïeb, and Jérémie Caillat We investigate a conjecture used in recent experiments to reconstruct the complete dynamics of Fano autoionization processes out of measured spectral amplitudes [Gruson et al. , Science 354 , 734 (2016) ; Beaulieu et al. , Science 358 , 1288 (2017) ; Busto et al. , J. Phys. B: At. Mol. Opt. Phys. 51 , 04400... [Phys. Rev. A 98, 053406] Published Wed Nov 07, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Angular interferences of sequentially ionized double-continuum wave packets (2018)

Xiao Wang and F. Robicheaux

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-09

Description: Author(s): Xiao Wang and F. Robicheaux Following the recent report of energy and angle interferences in below-threshold photoexcitation Auger processes due to postcollision interactions [Wang and Robicheaux, Phys. Rev. A 98 , 013421 (2018) ], similar interferences are also found in double-continuum wave packets from a two-step time-delayed... [Phys. Rev. A 98, 053407] Published Thu Nov 08, 2018

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Momentum gate for tunneling electrons with a circularly polarized control field (2018)

Dian Wang, Xiaosong Zhu, Liang Li, Xiaofan Zhang, Xi Liu, Pengfei Lan, and Peixiang Lu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-10

Description: Author(s): Dian Wang, Xiaosong Zhu, Liang Li, Xiaofan Zhang, Xi Liu, Pengfei Lan, and Peixiang Lu We propose and numerically demonstrate a method for selecting the electrons with specific transverse momentum at the exit of tunneling. The strategy is based on the manipulation of the consequent acceleration and recollision by adding a circularly polarized control field (CPCF) to an intense laser f... [Phys. Rev. A 98, 053410] Published Fri Nov 09, 2018

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Proposal for the formation of ultracold deeply bound RbSr dipolar molecules by all-optical methods (2018)

Adrien Devolder, Eliane Luc-Koenig, Osman Atabek, Michèle Desouter-Lecomte, and Olivier Dulieu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-10

Description: Author(s): Adrien Devolder, Eliane Luc-Koenig, Osman Atabek, Michèle Desouter-Lecomte, and Olivier Dulieu Ultracold paramagnetic and polar diatomic molecules are among the promising systems for quantum simulation of lattice-spin models. Unfortunately, their experimental observation is still challenging. Based on our recent ab initio calculations, we analyze the feasibility of all-optical schemes for the... [Phys. Rev. A 98, 053411] Published Fri Nov 09, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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High-order harmonic generation of the heteronuclear hydrogen molecular ion in strong infrared laser fields (2018)

Yu-Ning Yang, Liang Xu, and Feng He

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-10

Description: Author(s): Yu-Ning Yang, Liang Xu, and Feng He The high harmonic generation of heteronuclear hydrogen molecular ions in few-cycle infrared strong laser fields is studied by numerically simulating the time-dependent Schrödinger equation. By reversing the carrier envelope phase of the few-cycle laser pulse, the electron dynamics is reversed as wel... [Phys. Rev. A 98, 053409] Published Fri Nov 09, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Experimental demonstration of composite stimulated Raman adiabatic passage (2018)

Alexander Bruns, Genko T. Genov, Marcel Hain, Nikolay V. Vitanov, and Thomas Halfmann

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-14

Description: Author(s): Alexander Bruns, Genko T. Genov, Marcel Hain, Nikolay V. Vitanov, and Thomas Halfmann We experimentally demonstrate composite stimulated Raman adiabatic passage (CSTIRAP), which combines the concepts of composite pulse sequences and adiabatic passage. The technique is applied for population transfer in a rare-earth doped solid. We compare the performance of CSTIRAP with conventional ... [Phys. Rev. A 98, 053413] Published Tue Nov 13, 2018

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Spin-dressed relaxation and frequency shifts from field imperfections (2018)

C. M. Swank, E. K. Webb, X. Liu, and B. W. Filippone

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-15

Description: Author(s): C. M. Swank, E. K. Webb, X. Liu, and B. W. Filippone Critical dressing, the simultaneous dressing of two spin species to the same effective Larmor frequency, is a technique that can, in principle, improve the sensitivity to small frequency shifts. The benefits of spin dressing and thus critical dressing are achieved at the expense of generating a larg... [Phys. Rev. A 98, 053414] Published Wed Nov 14, 2018

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Three-dimensional alignment of asymmetric-top molecules induced by polarization-shaped optimal laser pulses (2018)

Masataka Yoshida, Norio Takemoto, and Yukiyoshi Ohtsuki

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): Masataka Yoshida, Norio Takemoto, and Yukiyoshi Ohtsuki Optimal control simulation is applied to numerically design nonresonant laser pulses that maximize the degrees of three-dimensional (3D) alignment of S O 2 using the lowest-order induced-dipole interaction. In our trials, combinations of more than two mutually orthogonal, linearly polarized subpulses ... [Phys. Rev. A 98, 053434] Published Mon Nov 26, 2018

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Photoassociative spectroscopy of a halo molecule in $^{86}\mathrm{Sr}$ (2018)

J. A. Aman, J. C. Hill, R. Ding, Kaden R. A. Hazzard, T. C. Killian, and W. Y. Kon

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-29

Description: Author(s): J. A. Aman, J. C. Hill, R. Ding, Kaden R. A. Hazzard, T. C. Killian, and W. Y. Kon Halo 86 Sr 2 molecules are photoassociated in their ground electronic state. The large sensitivity of the molecular binding energy to the near-resonant light suggests the possibility of probing naturally occurring Efimov states by optical means. [Phys. Rev. A 98, 053441] Published Wed Nov 28, 2018

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Improving the state selectivity of field ionization with quantum control (2018)

Vincent C. Gregoric, Jason J. Bennett, Bianca R. Gualtieri, Ankitha Kannad, Zhimin Cheryl Liu, Zoe A. Rowley, Thomas J. Carroll, and Michael W. Noel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-05

Description: Author(s): Vincent C. Gregoric, Jason J. Bennett, Bianca R. Gualtieri, Ankitha Kannad, Zhimin Cheryl Liu, Zoe A. Rowley, Thomas J. Carroll, and Michael W. Noel The electron signals from the field ionization of two closely spaced Rydberg states of rubidium-85 are separated using quantum control. In selective field ionization, the state distribution of a collection of Rydberg atoms is measured by ionizing the atoms with a ramped electric field. Generally, at... [Phys. Rev. A 98, 063404] Published Tue Dec 04, 2018

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Nuclear hyperpolarization of $^{3}\mathrm{He}$ by magnetized plasmas (2018)

A. Maul, P. Blümler, P.-J. Nacher, E. Otten, G. Tastevin, and W. Heil

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-06

Description: Author(s): A. Maul, P. Blümler, P.-J. Nacher, E. Otten, G. Tastevin, and W. Heil We describe a method, referred to as PAMP (polarization of atoms in a magnetized plasma), that allows hyperpolarization of He 3 nuclear spins at high magnetic field solely by excitation of a rf gas discharge. A magnetized plasma is obtained when the mean free path of the free electrons is much larger... [Phys. Rev. A 98, 063405] Published Wed Dec 05, 2018

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Type-II Zeeman slowing: Characterization and comparison to conventional radiative beam-slowing schemes (2018)

M. Petzold, P. Kaebert, P. Gersema, T. Poll, N. Reinhardt, M. Siercke, and S. Ospelkaus

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-08

Description: Author(s): M. Petzold, P. Kaebert, P. Gersema, T. Poll, N. Reinhardt, M. Siercke, and S. Ospelkaus We describe a Zeeman slowing method reported in [ New J. Phys. 20 , 042001 (2018) ] and compare it to conventional radiative beam-slowing schemes. The scheme is designed to work on a type-II level structure, making it particularly attractive for radiative beam slowing of molecules. Working on the D 1 li... [Phys. Rev. A 98, 063408] Published Fri Dec 07, 2018

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Double Stern-Gerlach experiments on $\mathrm{Mn}@{\mathrm{Sn}}_{12}$: Refocusing of a paramagnetic superatom (2018)

Thomas M. Fuchs and Rolf Schäfer

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-12

Description: Author(s): Thomas M. Fuchs and Rolf Schäfer We report magnetic double deflection experiments on cryogenically cooled Mn @ Sn 12 clusters. Refocusing efficiencies of up to 90% are achieved by keeping the magnetic-flux density virtually constant between the two Stern-Gerlach magnets. The spin dynamics are probed by introducing magnetic-flux densit... [Phys. Rev. A 98, 063411] Published Tue Dec 11, 2018

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Gauge invariance beyond the electric dipole approximation (2018)

Ryoji Anzaki, Yasushi Shinohara, Takeshi Sato, and Kenichi L. Ishikawa

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-12

Description: Author(s): Ryoji Anzaki, Yasushi Shinohara, Takeshi Sato, and Kenichi L. Ishikawa We study the gauge invariance of the laser-matter interaction. The velocity gauge, where the vector potential is expanded to the n th order with respect to the spatial coordinate, and the length gauge, where the electric and magnetic fields are expanded to the n th and ( n − 1 ) th orders, respectively, ar... [Phys. Rev. A 98, 063410] Published Tue Dec 11, 2018

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High-order above-threshold ionization beyond the electric dipole approximation: Dependence on the atomic and molecular structure (2018)

Simon Brennecke and Manfred Lein

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-14

Description: Author(s): Simon Brennecke and Manfred Lein We provide an in-depth analysis of high-order above-threshold ionization of atoms and molecules by strong laser pulses, using three different theoretical approaches beyond the electric dipole approximation: (i) the numerical solution of the time-dependent Schrödinger equation, (ii) the classical thr... [Phys. Rev. A 98, 063414] Published Thu Dec 13, 2018

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Role of intermediate continuum states in exterior complex scaling calculations of two-photon ionization cross sections (2018)

Andrej Mihelič

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): Andrej Mihelič The calculation of partial two-photon ionization cross sections in the above-threshold energy region is discussed in the framework of exterior complex scaling. It is shown that with a minor modification of the usual procedure, which is based on the calculation of the outgoing partial waves of the se... [Phys. Rev. A 98, 023409] Published Mon Aug 13, 2018

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Improvement of the ionization factor in the quantitative rescattering theory for simulating macroscopic high-order harmonic generation (2018)

Nazia Abro, Kan Wang, Xinhao Zhu, Baochang Li, and Cheng Jin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-15

Description: Author(s): Nazia Abro, Kan Wang, Xinhao Zhu, Baochang Li, and Cheng Jin We propose to correct the ionization factor in the quantitative rescattering (QRS) theory for a higher precision calculation of macroscopic high harmonic generation (HHG) in a gaseous medium. Compared to the first-order strong-field approximation (SFA-1) and the Ammosov-Delone-Krainov (ADK) ionizati... [Phys. Rev. A 98, 023411] Published Tue Aug 14, 2018

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