1. A. Harthcock and J. Laane, Calculation of two-dimensional vibrational potential energy surfaces utilizing prediagonalized basis sets and Van Vleck perturbation methods, J. Phys. Chem., (1985), 89, pp 4231 - 4240
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http://dx.doi.org/10.1021/j100266a0172. M. A. Harthcock and J. Laane, Calculation of kinetic energy terms for the vibrational Hamiltonian: Application to large-amplitude vibrations using one-, two-, and three-dimensional models, Journal of Molecular Spectroscopy, Volume 91, Issue 2 , February 1982, Pages 300-324
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http://dx.doi.org/10.1016/0022-2852(82)90147-3