H2-induced pressure broadening and pressure shift in the P-branch of the ν3 band of CH4 from 300 to 655 K

For accurate modelling of observations of exoplanet atmospheres, quantification of the pressure broadening of infrared absorption lines for and by a variety of gases at elevated temperatures is needed. Additionally, high-resolution high-temperature H -pressure-broadened spectra are recorded for the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 2019-09, Vol.239
Main Authors: Gharib-Nezhad, Ehsan, Heays, Alan N., Bechtel, Hans A., Lyons, James R.
Format: Article
Language:English
Subjects:
ENVIRONMENTAL SCIENCES
exoplanetary atmospheres
high-temperature FTIR spectroscopy
high-temperature pressure-induced collisional broadening and shift
hydrogen-dominant atmospheres
Lorentzian linewidth coefficients
Methane
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:For accurate modelling of observations of exoplanet atmospheres, quantification of the pressure broadening of infrared absorption lines for and by a variety of gases at elevated temperatures is needed. Additionally, high-resolution high-temperature H -pressure-broadened spectra are recorded for the CH4 ν -band P-branch. Measured linewidths for 143 transitions between 2840 and 3000 cm-1 with temperature and pressures ranging between 300 and 655 K, and 10 and 933 Torr, respectively, were used to find rotation- and tetrahedral-symmetry-dependent coefficients for pressure and temperature broadening and pressure-induced lineshifts. The new pressure-broadening data will be useful in radiative-transfer models for retrieving the properties of observed expolanet atmospheres.
ISSN:0022-4073
1879-1352