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Removing resonance effects from quantum mechanical vibrational partition functions obtained from perturbation theory

机译:从扰动理论获得的量子机械振动分配函数中消除共振效应

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This paper compares different methods for removing resonance effects from second-order perturbation theory calculations of vibrational energies in a variety of systems containing from two to six modes. Both the recently proposed method of Kuhler et al. and the standard approach of Nielsen yield stable energy levels even very close to resonance, with the latter giving smaller average errors in such cases. In addition, the method of Kuhler et al. is observed to affect the ground-state energy, unlike the standard approach. This generally worsens the accuracy of the vibrational partition function at room temperature, especially for systems close to resonance. (C) 1998 American Institute of Physics. [References: 27]
机译:本文比较了在包含两个到六个模式的各种系统中,从振动能量的二阶微扰理论计算中消除共振效应的不同方法。 Kuhler等人最近提出的方法。 Nielsen的标准方法可以产生稳定的能级,甚至非常接近共振,在这种情况下后者的平均误差较小。另外,Kuhler等人的方法。与标准方法不同,据观察,该方法会影响基态能量。这通常会降低室温下振动分配功能的准确性,尤其是对于接近共振的系统。 (C)1998美国物理研究所。 [参考:27]

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