Investigating local field tuning Fermi resonance of CS by Raman spectroscopy and DFT calculations.

In the spectroscopic study of polyatomic molecules, Fermi resonance (FR) is a vibrational coupling and energy transfer phenomenon that widely exists intra- and intermolecular. In particular, the FR coupling between the fundamental mode ν and the doubling mode 2ν of the CS molecule has attracted extensive research. In this work, we investigate the effect of local field on tuning the FR of CS.