Hydrogen-broadening coefficients in the ν5 band of CH3F at room and low temperatures

C. Lerot, G. Blanquet, J.-P. Bouanich, J. Walrand, M. Lepère

Research output: Contribution to journalArticlepeer-review


Using a tunable diode-laser spectrometer, H-broadening coefficients have been measured for 46 lines of CHF at room temperature (297.2 K), 5 lines at 223.2 K and 22 lines at 183.2 K in the ν fundamental band near 6.6 μm. These lines were individually fitted with Voigt, Rautian, and Galatry profiles in order to determine their collisional widths. The resulting broadening coefficients are compared with theoretical values derived from a semiclassical theory involving two intermolecular potentials. In addition to electrostatic contributions, the first potential involves induction and dispersion contributions and the second potential the atom-atom Lennard-Jones model. Comparing broadening coefficients at room and low temperatures, the temperature dependence of these broadenings has been determined both experimentally and theoretically.
Original languageEnglish
Pages (from-to)224-233
Number of pages10
JournalJournal of molecular spectroscopy
Issue number2
Publication statusPublished - 1 Aug 2006


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