O2- and air-broadening coefficients in the ν4 band of 12CH4 at room temperature

B. Martin, M. Lepère

Research output: Contribution to journalArticle


Using a diode laser spectrometer, 50 collisional broadening coefficients in the ν band of methane perturbed by oxygen have been measured at room temperature. We have analyzed ro-vibrational lines in the P- and R-branches with J values between 1 and 12 located in the spectral range between 1241.861 and 1373.201 cm. The Voigt and Rautian profiles have been used to determine the collisional half-widths. The collisional broadening coefficients are compared with those of various absorption bands. Furthermore, from these O-broadening coefficients and from the N-broadening coefficients previously measured for the same vibrational band, we have calculated air-broadening coefficients in the ν band of CH. These results based on a simple atmospheric composition are compared with a few coefficients that we have measured with dry air, and with HITRAN values.
Original languageEnglish
Pages (from-to)6-12
Number of pages7
JournalJournal of molecular spectroscopy
Issue number1
Publication statusPublished - 1 May 2009

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