Assignment of the Fundamental Vibrational Frequencies and Calculated Thermodynamic Functions for 1,1-Difluoro-2,2-dibromoethylene

The previous assignment of the fundamental vibrational frequencies of the CF2:CBr2 molecule has been revised in the light of the results of a recent normal coordinate analysis by Mann et al. and other evidence. The revised assignment is as follows: species a1: 1718, 1005, 598, 324, 168; species b1: 1037, 898, 399, 151; species b2: 572, 303; species a2: 151 cm—1. All but the two lowest wave numbers are for the gaseous state. Thermodynamic functions have been recalculated for the ideal gaseous state at 1 atmos pressure for 4 temperatures above the boiling point.