Abstract
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. High-resolution high-temperature H2-pressure-broadened spectra are recorded for the CH4 ν3-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.
| Original language | English (US) |
|---|---|
| Article number | 106649 |
| Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume | 239 |
| DOIs | |
| State | Published - Dec 1 2019 |
| Externally published | Yes |
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Keywords
- Exoplanetary atmospheres
- High-temperature FTIR spectroscopy
- High-temperature pressure-induced collisional broadening and shift
- Hydrogen-dominant atmospheres
- Lorentzian linewidth coefficients
- Methane (CH)
ASJC Scopus subject areas
- Radiation
- Atomic and Molecular Physics, and Optics
- Spectroscopy
Cite this
H2-induced pressure broadening and pressure shift in the P-branch of the ν3 band of CH4 from 300 to 655 K. / Gharib-Nezhad, Ehsan; Heays, Alan N.; Bechtel, Hans A.; Lyons, James R.
In: Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 239, 106649, 01.12.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - H2-induced pressure broadening and pressure shift in the P-branch of the ν3 band of CH4 from 300 to 655 K
AU - Gharib-Nezhad, Ehsan
AU - Heays, Alan N.
AU - Bechtel, Hans A.
AU - Lyons, James R.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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. High-resolution high-temperature H2-pressure-broadened spectra are recorded for the CH4 ν3-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.
AB - 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. High-resolution high-temperature H2-pressure-broadened spectra are recorded for the CH4 ν3-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.
KW - Exoplanetary atmospheres
KW - High-temperature FTIR spectroscopy
KW - High-temperature pressure-induced collisional broadening and shift
KW - Hydrogen-dominant atmospheres
KW - Lorentzian linewidth coefficients
KW - Methane (CH)
UR - http://www.scopus.com/inward/record.url?scp=85072296640&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072296640&partnerID=8YFLogxK
U2 - 10.1016/j.jqsrt.2019.106649
DO - 10.1016/j.jqsrt.2019.106649
M3 - Article
AN - SCOPUS:85072296640
VL - 239
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
SN - 0022-4073
M1 - 106649
ER -