https://www.elibrary.ru/title_about_new.asp?i Materials physics and mechanics Механика и физика материалов 1605-8119 2 Theory of Vibrations of Tetra-Atomic Symmetric Bent Molecules Theory of Vibrations of Tetra-Atomic Symmetric Bent Molecules Melker A.I. Krupina Kotov Peter the Great St. Petersburg Polytechnic University 30 04 2012 13 1 9 21

In this contribution we submit a theory of vibrations of a tetra-atomic symmetric bent molecule ABBA in cis-conformation. Compared to the previous calculations, where some approximations have been made, now we gave a more rigorous version. For the molecule studied we have calculated frequencies of all five vibrations. Among them three vibrations, ax1, ay1, and sy1, are normal or nearly normal. The longitudinal vibrations are of two types: (→← →←) and (→→ ←←).

 vibrations tetra-atomic symmetric bent molecule calculated frequencies vibration classification normal (or nearly normal) vibrations: ax1 ay1 sy1 longitudinal vibrations of two types