Diode-laser spectroscopy: Temperature dependence of R (0) line in the ν4 band of CH4 perturbed by N2 and O2

M. Lepère, A. Valentin, A. Henry, C. Camy-Peyret, Marc Lengelé, J.C. Populaire, G. Blanquet

Research output: Contribution to journalArticlepeer-review


In this paper, we present a line profile study of the R (0) line in the ν band of methane diluted in nitrogen and oxygen, from room temperature to 153 K. The measurements were performed over a total pressure range from 14 to 128 mbar. The collisional broadening and narrowing (Dicke effect) coefficients are derived from a fit of the experimental spectra by using the soft and hard collision models, taking into account the Dicke effect. For higher pressures, we have fitted the data with a model taking into account simultaneously the Dicke narrowing and the speed dependence effect. Finally, we have deduced the parameter n of the temperature dependence (inverse power law) of the broadening coefficients for the CH-N and CH -O gas mixtures.
Original languageEnglish
Pages (from-to)86-92
Number of pages7
JournalJournal of molecular spectroscopy
Issue number1
Publication statusPublished - 1 Sep 2005


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