N2-collisional broadening coefficients of lines in the ν2 band of chloromethane from low to room temperatures

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Using a high-resolution tunable diode-laser spectrometer, we measured N2-collisional broadening coefficients in the ν2 band of chloromethane. Measurements have been realized for 15 lines at room temperature and 5 lines at different low temperatures. For each line under study, we have recorded spectra at 4 pressures of perturber gas ranging from 12 to 55 mbar. The experimental line profiles, at each pressure and each temperature, have been fitted with three different line shape models. From these fits, we obtained the collisional half-width and accurately deduced N2-broadening coefficients at up to 4 temperatures between 200 K and 296 K. Using the usual empirical power law, we determined the temperature dependence parameter of the N2-broadening coefficients.

Original languageEnglish
Article number111269
JournalJournal of Molecular Spectroscopy
Publication statusPublished - Mar 2020


  • Chloromethane
  • Collisional broadening
  • Diode-laser
  • Nitrogen
  • Temperature dependence

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