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1. M. L. Eidinoff, J. G. Aston, The Rotational Entropy of Nonrigid Polyatomic Molecules// J. Chem. Phys. 3, 379, 1935.
2. D. G. Burkhard, J. C. Irvin, Solution of the Wave Equation for Internal Rotation of Two Completely Asymmetric Molecules// J. Chem. Phys. 23, 1405, 1955.
3. D. G. Burkhard, J. C. Irvin, Erratum: Solution of the Wave Equation for Internal Rotation of Two Completely Asymmetric Molecules // J. Chem. Phys. 23, 2469 (1955)
4. D. R. Herschbach, H. S. Johnston, K. S. Pitzer, R. E. Powell, Theoretical Pre‐Exponential Factors for Twelve Bimolecular Reactions // J. Chem. Phys. 25, 736, 1956.
5. C. Peng, P. Y. Ayala, H. B. Schlegel, M. J. Frisch, Using redundant internal coordinates to optimize equilibrium geometries and transition states // J. Comput. Chem. 17, 49, 1996.
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http://dx.doi.org/10.1002/(SICI)1096-987X(19960115)17:1<49::AID-JCC5>3.0.CO;2-0