Pressure broadening parameters and cross sections for the CH 3F-He system have been measured between 4.2 and 1.9 K by means of a recently developed technique based on collisional cooling in a cryogenic cell. The cross sections for the K = 0 and K = 1 components of the J = 1-2 transition were found to be 75.2 and 66.6 Å2, respectively, at 4.2 K and 55.5 and 54.5 Å2, respectively, at 1.9 K. The cross sections at 4.2 K are about 50% larger than the 300 K values. These results are compared with earlier experimental and theoretical results obtained for the CO-He system.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry