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  • 1
    Electronic Resource
    Electronic Resource
    The Langmuir probe as a diagnostic of the electron component within low temperature laser ablated plasma plumes (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1801-1805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Langmuir probe has been used as a diagnostic of the temporally evolving electron component within a laser ablated Cu plasma expanding into vacuum, for an incident laser power density on target similar to that used for the pulsed laser deposition of thin films. Electron temperature data were obtained from the retarding region of the probe current/voltage (I/V) characteristic, which was also used to calculate an associated electron number density. Additionally, electron number density data were obtained from the saturation electron current region of the probe (I/V) characteristic. Electron number density data, extracted by the two different techniques, were observed to show the same temporal form, with measured absolute values agreeing to within a factor of 2. The Langmuir probe, in the saturation current region, has been shown for the first time to be a convenient diagnostic of the electron component within relatively low temperature laser ablated plasma plumes. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149672
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "Optical investigation of quaternary GalnAsSb/AlGaAsSb strained multiple quantum wells'' [Appl. Phys. Lett. 67, 3432 (1995)] (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2591-2591 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116792
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  • 3
    Electronic Resource
    Electronic Resource
    Rydberg and charge transfer states of F atoms in neon matrices (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 48-56 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interaction of an electronically excited F atom with the neon matrix is investigated using absorption, excitation, and fluorescence spectroscopy. Upon vacuum ultraviolet excitation of a neon matrix doped with fluorine atoms, emissions are observed at 12.80, 13.08, and 15.48 eV. The emissions at 13.08 and 15.48 eV have a lifetime of 0.7(0.2) ns and are assigned to the radiative relaxation of the 3s and 3s' Rydberg F atomic states. The emission at 12.80 eV has a detection limited lifetime less than 0.4 ns and is identified as emission from the Ne+F− charge transfer complex. Absorption and excitation spectra of each of the observed emissions are used to identify the Rydberg absorptions of the F atoms perturbed by the neon matrix at 13.99, 16.27, 16.49, 16.94, 17.22, and 19.02 eV. The Rydberg states belong to ns, ns', and nd progressions with the same quantum defect as in the gas phase and a blueshift of the vertical ionization energies of 0.8 eV. The Stokes shift of 910 and 790 meV for the 3s and 3s' states and the large linewidth are attributed to a strong electron phonon coupling with Huang–Rhys factors of about 70. A two-dimensional configuration coordinate model explains the observed absorption, excitation and emission spectra, and the branching ratios of emission from Rydberg and charge transfer states. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469427
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: Photoluminescence of quaternary GaInAsSb/AlGaAsSb strained multiple quantum wells [J. Appl. Phys. 78, 5696 (1995)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4474-4474 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362717
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  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence depletion spectroscopy of the CH/D–Ne B 2Σ−–X 2Π transition (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 7218-7227 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fluorescence depletion techniques were used to test vibronic and rotational assignments for the B 2Σ−–X 2Π transition of CH–Ne. Previous vibronic assignments [W. H. Basinger, U. Schnupf, and M. C. Heaven, Faraday Discuss. 97, 351 (1994)] were confirmed, and observations of transitions to dissociation continua provided accurate dissociation energies for the B and X states. Errors in the rotational assignments were discovered. Re analysis of the rotational structure yielded ground state parity splittings and improved rotational constants. Adiabatic model calculations were used to determine approximate angular potential energy curves for the B and X states. These calculations also accounted for the prominent optical activity of internal rotation in the spectrum. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470297
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  • 6
    Electronic Resource
    Electronic Resource
    Direct observation of the femtosecond nonradiative dynamics of azulene in a molecular beam: The anomalous behavior in the isolated molecule (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 9785-9788 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using femtosecond-resolved mass spectrometry in a molecular beam, we report real-time observation of the nonradiative, anomalous dynamics of azulene. We studied both S2 and S1 state dynamics. The motion of the wave packet in S1 involves two time scales, a dephasing time of less than 100 fs and a 900±100 fs internal conversion. We discuss the dynamical picture in relation to the molecular structures and the conical intersection, and we compare with theory. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478031
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopy and nonadiabatic predissociation of CN–Ne (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 7163-7178 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectroscopy and predissociation dynamics of CN–Ne were investigated using a variety of laser excitation techniques. Properties of the A 2Π state (vibrational levels v=2, 3, and 4) were characterized through studies of the A–X system. Both spin–orbit components of CN(A)–Ne were subject to predissociation. The upper component (Ω=1/2) was predissociated by rapid spin–orbit relaxation (τ(approximate)6 ps, no vibrational dependence). The lower component (Ω=3/2) was predissociated by the nonadiabatic internal conversion process, CN(A 2Π3/2,v)–Ne→CN(X 2 Σ+,v+4)+Ne. Rates for predissociation by internal conversion were found to be exponentially dependent on the energy gap between the initial and final CN levels. These rates were relatively slow, permitting observation of rotationally resolved spectra for bands associated with the monomer Ω=3/2 v=3 and 4 levels. Double resonance techniques were used to simplify the spectra and establish ro-vibronic assignments. Details of the intermolecular potential-energy surfaces were derived from these data. CN final state population distributions resulting from spin–orbit and internal conversion predissociation were characterized. For the former, excess energy was channeled into rotational excitation of CN, and levels of−parity were preferentially populated. The excess energy in predissociation by internal conversion was released primarily to translational recoil. In the accompanying paper, Yang and Alexander present ab initio potential surfaces for CN–Ne. From these surfaces they predict ro-vibronic energies and predissociation rates for levels associated with A, v=3. Results that depended on the A state surface alone were found to be in good agreement with experiment. Comparison of the internal conversion predissociation rates indicates that the ab initio calculations underestimated the coupling between the A and X states. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474956
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  • 8
    Electronic Resource
    Electronic Resource
    Spectroscopy of F2 in Ne matrices (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 1318-1329 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The excited states of free and matrix-isolated F2 were investigated in the windowless VUV region by absorption and excitation spectroscopy. In emission the f 3Πg→a 3Πu laser band of F2 at 7.72 eV with a radiative lifetime of 2 ns and a weaker and broader band at 7.47 eV attributed to emission of F2 aggregates are observed in an Ne matrix independent on excitation energy. The Franck–Condon envelope of the charge transfer state C 1Σ+u extends further to the blue by more than 1 eV in Ne (12 to 14 eV) compared to the gas phase due to a blueshift of the avoided crossing with the Rydberg 3pπu(1Σ+u) state. The H 1Πu Rydberg state remains unperturbed in the Ne matrix but is blueshifted by 1.24 eV and significantly broadened due to electron–phonon coupling. A previously unreported broad absorption is observed both in the gas phase and in the matrix around 15 eV and is assigned to a strongly perturbed charge transfer state with Σ symmetry corresponding to F+*(1S) and F−(1S) ions in the dissociation limit. This charge transfer state is strongly perturbed in the gas phase by the high density of npπu(1Σ+u) Rydberg states (n≥4) while in Ne matrix it is mixed mainly with the low-lying 4pπu(1Σ+u) state. The analogy of the resulting two separated groups of bands with irregular vibrational progressions to the Cl2 case is shown. Further npπu and npσu Rydberg progressions and the repulsive 3Σ+u valence state are treated. The utility of matrix-isolated F2 for a solid state laser is discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471998
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  • 9
    Electronic Resource
    Electronic Resource
    Spectroscopy of argon fluoride and krypton fluoride exciplexes in rare gas matrices (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 10178-10188 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectroscopy of argon fluoride and krypton fluoride exciplexes in rare gas matrices is investigated using synchrotron radiation over the range of 50 to 600 nm. The diatomic Ar+F− and Kr+F− species are observed in excitation and emission spectra. Extensive vibrational progressions are observed in the excitation spectra and are used to determine the spectroscopic parameters of the ArF B state (Te=50233 cm−1,ωe=415.5 cm−1, ωexe=3.1 cm−1) and D state (Te=51738 cm−1,ωe=476.7 cm−1,ωexe=3.8 cm−1) and of the KrF B state (Te=39024 cm−1,ωe=342.4 cm−1,ωexe=2.0 cm−1) and D state (Te=44479 cm−1,ωe=331.6 cm−1,ωexe=1.4 cm−1). Lifetimes of 4 to 8 ns are measured for the diatomic emissions. A perturbed KrF species is observed which is identified in analogy to a similarly perturbed XeF species. Excitation spectra of the triatomic exciplexes Kr+2F− and Ar+2F− in neon are presented and described in terms of previous ab initio calculations. Emission and excitation of argon fluoride and krypton fluoride species in other matrices are presented. Large stimulated emission cross sections on the order of 10−16 cm2 are determined for the diatomic D→X and B→X emissions, which, together with nonradiative relaxation processes within the B and D states of ArF that efficiently populate the B(v=0) regardless of initial excitation, make ArF in neon a viable solid-state laser candidate. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472731
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  • 10
    Electronic Resource
    Electronic Resource
    Femtosecond β-cleavage dynamics: Observation of the diradical intermediate in the nonconcerted reactions of cyclic ethers (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 7933-7936 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Femtosecond (fs) dynamics of reactions of cyclic ethers, symmetric and asymmetric structures, are reported. The diradical intermediates and their β-cleavages, which involve simultaneous C-C, C-H σ-bond breakage and C-O, C-C π-bond formation, are observed and studied by fs-resolved mass spectrometry. To compare with experiments, we present density functional theory calculations of the potential energy surface and microcanonical rates and product distributions. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476409
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