Note: unless otherwise stated, the broadening coefficients for the principal (most abundant) isotopologue can be used for other isotopologues of the same molecule.

• 12C-1H4__He.broad [17.9 KB]
  CH4 - He pressure broadening parameters (main isotopologue)
• 12C-1H4__H2.broad [6.5 KB]
  CH4 - H2 pressure broadening parameters (main isotopologue)
• 12C-1H4__CO2.broad
  CH4 - CO2 pressure broadening parameters (main isotopologue)
• 12C-1H4__air.broad
  CH4 - air pressure broadening parameters (main isotopologue).

References

1. Varanasi, P., Chudamani, S., "The temperature dependence of lineshifts, linewidths and line intensities of methane at low temperatures", Journal of Quantitative Spectroscopy and Radiative Transfer 43, 1-11 (1990). [link to article][90VaChxx.CH4]
2. Pine, A. S., "Self‐, N₂, O₂, H₂, Ar, and He broadening in the ν₃ band Q branch of CH₄", Journal of Chemical Physics 97, 773-785 (1992). [link to article][92Pine.CH4]
3. Fox, K., Jennings, D. E., Stern, E. A., Hunnard, R., "Measurements of argon-, helium-, hydrogen-, and nitrogen-broadened widths of methane lines near 9000 cm⁻¹", Journal of Quantitative Spectroscopy and Radiative Transfer 39, 473-476 (1998). [link to article][98FoJeSt.CH4]
4. Varanasi, P., Tejwani, G. D. T., "Experimental and theoretical studies on collision-broadened lines in the v₄-fundamental of methane", Journal of Quantitative Spectroscopy and Radiative Transfer 12, 849-855 (1972). [link to article][72VaTexx.CH4]
5. Varanasi, P., Chudamani, S., "Measurements of collision-broadened line widths in the v₄-fundamental band of ¹²CH₄ at low temperatures", Journal of Quantitative Spectroscopy and Radiative Transfer 41, 335-343 (1989). [link to article][89VaChxx.CH4]
6. Grigoriev, I. M., Filippov, N. N., Tonkov, M. V., Gabard, T., Le Doucen, R., "Estimation of line parameters under line mixing effects: the ν₃ band of CH₄ in helium", Journal of Quantitative Spectroscopy and Radiative Transfer 69, 189-204 (2001). [link to article][01GrFiTo.CH4]
7. Gabard, T., Grigoriev, I. M., Grigorovich, N. M., Tonkov, M. V., "Helium and argon line broadening in the ν₂ band of CH₄", Journal of Molecular Spectroscopy 225, 123-131 (2004). [link to article][04GaGrGr.CH4]
8. Manne, J., Bui, T. Q., Webster, C. R., "Determination of foreign broadening coefficients for methane lines targeted by the Tunable Laser Spectrometer (TLS) on the Mars Curiosity Rover", Journal ofQuantitativeSpectroscopy and RadiativeTransfer 191, 59-66 (2017). [link to article][17MaBuWe.CO2]
9. Vispoel, B., Fissiaux, L., Lepère, M., "CO₂-broadening coefficients in the ν₃ fundamental band of methane", Journal of Molecular Spectroscopy 360, 1-6 (2019). [link to article][19ViFiLe.CH4]
10. Lyulin, O. M., Petrova, T. M., Solodov, A. M., Solodov, A. A., Perevalov, V. I., "Measurements of the broadening and shift parameters of methane spectral lines in the 5550–6140cm^-1 region induced by pressure of carbon dioxide", Journal of Quantitative Spectroscopy and Radiative Transfer 147, 164-170 (2014). [link to article][14LyPeSo.CH4]
11. Fissiaux, L., Delière, Q., Blanquet, G., Robert, S., Vandaele, A. C., Lepère, M., "CO₂-broadening coefficients in the ν₄ fundamental band of methane at room temperature and application to CO₂-rich planetary atmospheres", Journal of Molecular Spectroscopy 297, 35-40 (2014). [link to article][14FiDeBl.CH4]
12. Guest, E.R., Tennyson, J., Yurchenko, S.N., "Modelling the Rotational Dependence of Line Broadening using Machine Learning", Journal of Molecular Spectroscopy 401, 111901 (2024). [link to article]