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  • 1
    Electronic Resource
    Electronic Resource
    Recombination of Br−2 photodissociated within mass selected ionic clusters (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6200-6210 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photofragmentation studies of mass selected Br−2⋅(CO2)n, n≤24, cluster ions are presented. The heterogeneous cluster ions are synthesized in a supersonic expansion crossed with an electron beam. These ionic clusters are mass analyzed in a time-of-flight mass spectrometer prior to photodissociation of the Br−2 absorber in the cluster. Mass analysis of the ionic photofragments shows that in some cases the photodissociated Br−2 has recombined and in other cases a Br atom has escaped from the cluster. The branching ratio for recombination depends on both the size of the initial cluster ion and the photodissociation wavelength. The photofragmentation data are consistent with a recombination mechanism dominated by attractive forces in the smaller clusters and repulsive interactions in the larger clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454458
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  • 2
    Electronic Resource
    Electronic Resource
    Photofragmentation of (CO2)+nB: Simple energy dependence for the number of neutrals ejected, 13〈n〈26 (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 5288-5289 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ionic photofragmentation patterns of (CO2)+n, 2〈n〈26, are determined at 1064, 650, and 532 nm, and are found to be remarkably simple. The average number of neutral CO2 molecules lost increases smoothly with cluster size, approaching a constant value that depends linearly on the photon energy. A model for involving sequential loss of CO2 monomers is indicated, and the average CO2-cluster bond energy is found to be constant at 4.9 kcal/mol for n〉13.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448605
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and dynamics of the keto and enol forms of acetylacetone in the solid state (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 5694-5700 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The tunneling and librational dynamics of the methyl groups of acetyl-acetone were investigated by inelastic and quasielastic neutron scattering at ambient and high pressure (4 kbar) for a variety of isotopic compounds. Samples, prepared by quenching the liquid, are shown to consist of a mixture of keto and enol forms of the molecule. This fact explains difficulties in the data analysis of previous studies. In the present work the contributions of the two forms could be separated, by preparing pure enol samples as well as keto-enriched samples. Two inequivalent methyl groups are identified for the enol form with barrier heights of the hindering potential in the range of 220–800 K. These potential barriers are fairly sensitive to deuteration of the nonmethyl protons and to disorder in the crystal. In contrast, for the keto form the potential is insensitive to these factors. These differences reflect the influence of the hydrogen-bonded proton on the methyl group dynamics in the enol molecule. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456032
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  • 4
    Electronic Resource
    Electronic Resource
    Argon predissociation and electron autodetachment spectroscopy of size-selected CH3NO2−⋅Arn clusters (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 10718-10723 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodetachment spectra of CH3NO2−⋅Arn clusters in the mid-IR are dominated by three strong resonances. These are assigned to autodetaching (AD) C–H stretching vibrational transitions in the valence (as opposed to dipole-bound) form of the molecular anion on the basis of a H/D isotopic substitution study and their solvation dependence. The AD resonances disappear promptly upon addition of the third argon atom, while the resonant structure appears in the action spectrum for formation of CH3NO2− photoproducts for n≥2. The strong argon solvation dependence of the photoproducts is traced to the rapidly changing endoergicity of the electron loss channel due to the differential solvation behavior of the valence anion relative to the neutral. We discuss a statistical limit for this competition, and introduce an intramolecular vibrational energy redistribution mediated AD mechanism unique to polyatomic anions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1418251
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  • 5
    Electronic Resource
    Electronic Resource
    Design of electromagnetic devices using commercial finite element programs (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 2317-2323 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The two-dimensional electrostatic modeling capability of the ANSYS finite element program is used in the design of the coax-to-parallel plate microwave transformer. Its two-dimensional axisymmetric capability is used in the design of a laser-triggered coaxial Blumlein spark gap. Finally, its three-dimensional magnetic modeling ability is used to model a large dipole magnet (the Chicago cyclotron magnet). The results of the calculations compare well with measurements for two of the above cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139344
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  • 6
    Electronic Resource
    Electronic Resource
    A pulsed supersonic entrainment reactor for the rational preparation of cold ionic complexes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4431-4434 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an ion source for the efficient preparation of cold ion-molecule complexes, X−⋅M. The method relies on condensation of solvent molecules, M, onto argon-solvated ions, X−⋅Arm, where the X−⋅Arm species are formed in a primary expansion and the molecular partner, M, is interfaced to this flow in the hydrodynamic region by supersonic entrainment. This hybrid "supersonic afterglow" reactor provides a clean synthetic approach for both bare and argon-solvated complexes, where the latter are particularly useful since their structures can be characterized by "nanomatrix" infrared predissociation spectroscopy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326931
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  • 7
    Electronic Resource
    Electronic Resource
    A Comment on "On the corotating frame and evolution equations in kinetic theory'' (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 2341-2342 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451085
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  • 8
    Electronic Resource
    Electronic Resource
    BaI product state distribution from the reaction Ba+CF3I (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 5723-5732 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Under single-collision beam–gas scattering conditions the Ba+CF3I→Bal+CF3 reaction has been studied using laser induced fluorescence to detect the BaI X 2∑+ product. The resulting BaI C 2Π–X 2∑+ excitation spectrum has a complex appearance owing to the similarity of the upper and lower state rotational constants, causing a reversal in band shading, and owing to a predissociation in the upper state, causing a break off in the fluorescence of high vibrational levels in each spin-orbit subband. From the predissociation onset an upper bound of 78.5±0.5 kcal/mol is placed on the BaI bond energy. The vibrational population distribution is shown to be bell shaped, peaking near v‘=50, and accounts for most of the available energy. The average energy appearing in BaI rotation decreases with increasing BaI vibrational excitation. The BaI rotational distribution has a width comparable to that of the vibrational distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451533
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  • 9
    Electronic Resource
    Electronic Resource
    Electron tunneling time measured by photoluminescence excitation correlation spectroscopy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 552-554 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The tunneling time for electrons to escape from the lowest quasibound state in the quantum wells of GaAs/AlAs/GaAs/AlAs/GaAs double-barrier heterostructures with barriers between 16 and 62 A(ring) has been measured at 80 K using photoluminescence excitation correlation spectroscopy. The decay time for samples with barrier thicknesses from 16 A(ring) (≈12 ps) to 34 A(ring)(≈800 ps) depends exponentially on barrier thickness, in good agreement with calculations of electron tunneling time derived from the energy width of the resonance. Electron and heavy hole carrier densities are observed to decay at the same rate, indicating a coupling between the two decay processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100928
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  • 10
    Electronic Resource
    Electronic Resource
    Carrier lifetimes in ion-damaged GaAs (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2424-2426 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence excitation correlation spectroscopy has been used to measure the dependence of carrier lifetime on the H+ ion implantation dose in GaAs. For doses greater than 1×1012 cm−2 the carrier lifetime is inversely proportional to the ion dose. The minimum lifetime measured was 0.6±0.2 ps for a dose of 1×1014 cm−2. Most important, there is no sign of saturation of carrier lifetime with ion dose down to this lifetime, thus still shorter lifetimes should be achievable with increased ion dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101096
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