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  • 74.70.Vy  (2)
  • ATOMIC AND MOLECULAR PHYSICS  (2)
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  • 1
    facet.materialart.
    Unknown
    Transformation theory and translation factors in inelastic atomic collisions (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: It is shown through the use of transformation theory that unique semiclassical atomic scattering states which obey the asymptotic conditions of formal scattering theory can be derived by transforming 'nontraveling' atomic states, ie., states whose coordinate variables are referred to a stationary origin, to frames at rest with respect to the incoming or outgoing particles. An overview of the problem of properly defining such scattering states is presented. The operator which carries out the necessary transformation from inertial to noninertial frames is derived and its properties are discussed. The relation of this transformation operator to the 'translation factor' discussed in the literature is presented. The application of this operator to transform the time-dependent Schroedinger equation from an inertial to a noninertial frame is presented and shown to introduce new terms in the resulting equation. The implications of these new terms to scattering problems are discussed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A - General Physics; vol. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Theory of inelastic ion-atom scattering at low and intermediate energies (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Ab initio calculations are presented of inelastic energy loss and ionization phenomena associated with Ar(+)-Ar collisions at small distances of closest approach and for laboratory collision energies ranging from several keV to several hundred keV. Outer-shell excitations are handled statistically; inner-shell excitations are calculated from the viewpoint of quasidiabatic molecular orbital promotion. Auger electron yield, average state of ionization, and average inelastic energy loss are calculated per collision as a function of distance of closest approach of the collision partners for several laboratory collision energies. Average charge-state probabilities per collision partner are calculated as a function of the average inelastic energy loss per atom. It is shown that the structure in the data is due to the underlying structure in the inner-shell independent-electron quasimolecular promotion probabilities.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A - General Physics; vol. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    Electronic Resource
    Electronic Resource
    The electronic quantum size effect observed by195Pt NMR in the metal cluster compound Pt309Phen 36 * O30 (1993)
    Springer
    The European physical journal 26 (1993), S. 21-23 
    Details
    ISSN: 1434-6079
    Keywords: 74.30.Gn ; 74.70.Vy ; 76.60.Es
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 195Pt NMR on the organic ligand stabilized metal cluster compound Pt309Phen 36 * O30 reveals two separate peaks in the lineshape. Ligand-bonded platinum atoms at the surface of the core are thought to be responsible for the peak that does not show any Knight shift. The corresponding spin-lattice relaxation timeT 1 is of the order of seconds. The second peak is Knight shifted and is attributed to the other Pt atoms, for which metallic behavior is inferred from the temperature dependence ofT 1. The Korringa relation holds down to 65 K. Below 65 K the relaxation of the magnetization becomes increasingly non-exponential with decreasing temperature. The relaxation process can be successfully modelled under the assumption of a Poisson distribution of the energy levels around the Fermi energy (the electronic quantum size effect).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425605
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Solid state magic angle spinning13C and31P NMR of organic ligand stabilized high nuclearity metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 24-26 
    Details
    ISSN: 1434-6079
    Keywords: 74.30.Gn ; 74.70.Vy ; 76.60.Es
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 13C and31P solid state NMR measurements on the organic ligands in ligated Au55, Ni8, Pt309, Cu36 and Cu70 clusters are reported. The ligands behave like diamagnetic organic molecules, giving rise to relatively narrow lines with excellent cross-polarization efficiency. The resonance lines of the nuclei directly bound to the metal core are systematically broadened in the conducting compounds. No pronounced Knight shifts or evidence of metallic-like relaxation were observed. These results support a model for the electrical conduction involving tunneling between metal cores with the ligands playing the role of a tunneling barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425606
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    Paper (German National Licenses)
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