The state-of-the-art symmetry methods for the consistent quantum-mechanical treatment of intramolecular motions are reviewed. It is shown that for a broad class of topical problems, these methods are not only self-sufficient but, at present, the only possible ones. In particular, they greatly simplify the analysis of nonrigid molecules, for which conventional, analytical equation-of-motion methods run into serious mathematical difficulties even at low excitation energies.

PACS: 02.70.Ns, 34.30.+h, 35.20.-i, 36.20.−r (all) DOI: 10.1070/PU1999v042n06ABEH000541 URL: https://ufn.ru/en/articles/1999/6/f/ 000081542900006 Citation: Burenin A V "Qualitative intramolecular quantum dynamics" Phys. Usp. 42 591–602 (1999) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Оригинал: Буренин А В «Качественная внутримолекулярная квантовая динамика» УФН 169 673–685 (1999); DOI: 10.3367/UFNr.0169.199906f.0673