CO2-broadening coefficients in the ν4 fundamental band of methane at room temperature and application to CO2-rich planetary atmospheres

Laurent Fissiaux, Quentin Delière, Ghislain Blanquet, Séverine Robert, Ann Carine Vandaele, Muriel Lepère

Research output: Contribution to journalArticlepeer-review


Using a tunable diode-laser spectrometer, we have measured the CO 2-broadening coefficients of 28 absorption lines in the ν4 band of CH4. Each line was recorded at room temperature (296 K) and at 4 different pressures, ranging from 8 to 50 mbar. The experimental determination of the CO2-broadening coefficients was performed by fitting a theoretical profile to the experimental profile of each line recorded at each pressure. Voigt, Rautian-Sobel'man and Galatry models were therefore used. The impact of these determinations on atmospheric investigations on CO2-rich planetary atmospheres are addressed. © 2014 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalJournal of molecular spectroscopy
Early online date14 Jan 2014
Publication statusPublished - 1 Mar 2014


  • Carbon dioxide
  • CH
  • Collisional broadenings
  • Diode-laser
  • ExoMarsTGO
  • Planetary atmospheres


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