摘要
Ⅰ. INTRODUCTIONIsotopic frequency shifts of vibrational frequencies of polyatomic molecules bring much benefit to the determination of force field constants. There are a variety of isotopic substitution rules for molecular vibrational fundamental frequencies, all of which are based on the GF matrix method, that is, with small vibrational amplitude approximation. For X-H(X=C, N, O, S, etc.) stretching vibrations with large anharmonicity, we discover at least
基金
Project supported by the National Natural Science Foundation of China.
