Abstract
In this paper the Raman spectrum of liquid C2F6 in the spectral region 250–1500cm−1 is presented. Data on six fundamental Raman bands of C2F6 are obtained. Doublets are observed in the spectral regions of the ν1 (A1g) (1416.3cm−1, 1425.0cm−1) and ν7 (Eg) (1221.9cm−1, 1239.7cm−1) fundamental bands. The structure of these bands is explained in terms of the Fermi resonances of ν7∼(2ν8)∼(ν6+ν11) (Eg) and ν1∼(2ν6) (A1g) states. The values of the cubic potential energy constant K166=7.7 (2)cm−1 and the effective matrix element of a threefold interaction Weff=8.5(5)cm−1 were derived from the simultaneous processing of the doublet parameters in the Raman spectrum of liquid C2F6 and in the IR spectrum of C2F6 in liquid N2.
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