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1996 (1)
1Author    Gerhard TaubmannRequires cookie*
 Title    Calculation of the Partition Function of a Double Minimum Oscillator from a Modified Variation Perturbation Method  
 Abstract    The partition function of a double minimum oscillator is evaluated by means of variation perturbation theory. For low temperatures, the method cannot be applied in the usual way. Even for a symmetric double minimum potential VDM(-C), the shift of the harmonic reference oscillator is not always zero as expected, but its minimum is near one of the minima of VDM(^) at low temperatures. The partition function thus calculated is only half the correct value. For sufficiently high temperature, the method works normally. The anomaly in the low temperature region is investigated in detail, and a modification of the variation perturbation method is suggested which eliminates most of the problems. 
  Reference    Z. Naturforsch. 51a, 249—256 (1996); received September 29 1995 
  Published    1996 
  Keywords    partition function, double minimum oscillator, inversion modes, variation perturbation theory, Pitzer-Gwinn method 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0249.pdf 
 Identifier    ZNA-1996-51a-0249 
 Volume    51