Vibrational overtone spectroscopy of the 41 band of CHF3

✍ Scribed by D. Romanini; A. Campargue

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 519 KB
• Volume: 254
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00304-1

✦ Synopsis

The spectra of the 41 CH stretch-bend overtone band of ~2CHF3 and 13CnF3 have been obtained at room temperature by intracavity laser absorption spectroscopy of a CHF 3 sample with natural isotopic abundances. The two bands display a resolved and mostly unperturbed J rotational structure. At the present resolution of 0.02 cm-1 (half-width), the P and R branch J clumps have well resolved Lorentzian profiles with full-widths fluctuating between 0.06 and 0.15 cm-1, and an average value that agrees well with previous estimates. As pressure broadening was negligible, these are homogeneous linewidths given by intramolecular energy redistribution. The linewidth fluctuations are consistent with a two-step purely anharmonic coupling of the transition upper state to a dense rovibrational bath.