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  • Articles  (2)
  • American Institute of Physics (AIP)  (2)
  • Oxford University Press
  • Wiley-Blackwell
  • 2015-2019
  • 1985-1989  (2)
  • 1985  (2)
Collection
  • Articles  (2)
Source
Publisher
Years
  • 2015-2019
  • 1985-1989  (2)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Heisenberg spin chains: Quantum-classical crossover and the Haldane conjecture (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3319-3321 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A comprehensive investigation has been made of the spectral excitations and static properties of Heisenberg antiferromagnetic chains of spin 1/2, 1, 3/2, and 2, using Lanczös, Bethe Ansatz, and Monte Carlo techniques. An unusual and unanticipated crossover mechanism for spin chains with 1/2≤S≤∞ has been discovered. The validity of the Haldane conjecture concerning the presence of a spectral excitation gap for integer-spin chains has been investigated by exact finite chains calculations of (a) the primary singlet-triplet excitation gap, (b) higher excitation gaps, and (c) the Fourier transform of the ground state correlation functions. A new Monte Carlo method has extended the spin-1 gap calculations to N=32.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335134
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A laser-induced fluorescence and information-theory investigation of energy transfer processes in benzene–argon collisions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 810-821 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports the results of an extensive study of the internal energy-transfer processes that occur in benzene–argon collisions. We used laser-induced fluorescence and information theory for determining the energy-transfer rates between internal states of benzene in the ground electronic state (1A1g). The method provides an estimate for the rate of rotational relaxation. It gives a measure of the fraction of molecules that absorb the laser radiation at a frequency near the center of the ν18 absorption band of benzene. The use of information theory gives estimates for all of the vibrational energy transfer rates. These fit the experimental data reasonably well. However, some of the data do deviate from the information theory model. This suggests that the statistical assumptions of the model are not sufficiently restrictive. One such restriction may be in the number of vibration quanta changing per collision..
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448507
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    Paper (German National Licenses)
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