Infrared band shapes and band strengths of CF2Cl2 from 800 to 1200 cm−1 at 296 and 200 K

Infrared profiles and strength measurements have been obtained at a spectral resolution of 1.6 cm−1 for the absorption bands of CF2Cl2 (fluorocarbon 12) from 800 to 1200 cm−1 at 296 and 200 K. A slight temperature dependence of the band strength seems to be observed for the ν3 + ν9 combination band and for the (ν3 + ν9) ν6 and (ν1) ν8 band systems. The low-temperature band profiles become narrower and the Q branches stronger than they are at room temperature. In particular, for the ν6 band, which is important for atmospheric sensing, the absorption coefficient shows an enhancement of 30% between 296 and 200 K at the peaks of the Q branch. These room temperature and low-temperature data may be useful for greenhouse calculations.