Multispectrum fits for line mixing in the ν3 band Q branch of methane

✍ Scribed by A.S. Pine; T. Gabard

• Book ID: 104151686
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 240 KB
• Volume: 217
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(02)00011-5

✦ Synopsis

First-order line-mixing coefficients and model relaxation matrix element scaling factors have been obtained for allowed transitions in the m 3 band Q branch of CH 4 broadened by H 2 , He, N 2 , O 2 , Ar, and CH 4 . The broadening, shifting, Dicke-narrowing, and line-mixing parameters are determined by simultaneous least-squares fitting of spectra at pressures from 0.014 to 66.66 kPa recorded with a high-resolution difference-frequency laser. These results confirm, improve, and extend a previous analysis of the lower pressure (613.3 kPa) data [A.S. Pine, J. Chem. Phys. 97 (1992) 773] which yielded averaged coefficients of individually fit spectra where adjacent broadened lines are still partially resolved.