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Collision‐Induced Absorption of CH 4 ‐CO 2 and H 2 ‐CO 2 Complexes and Their Effect on the Ancient Martian Atmosphere
Author(s) -
Godin Paul J.,
Ramirez Ramses M.,
Campbell Charissa L.,
Wizenberg Tyler,
Nguyen Tue Giang,
Strong Kimberly,
Moores John E.
Publication year - 2020
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
eISSN - 2169-9100
pISSN - 2169-9097
DOI - 10.1029/2019je006357
Subject(s) - atmosphere (unit) , bar (unit) , absorption (acoustics) , analytical chemistry (journal) , mars exploration program , atomic physics , absorption spectroscopy , atmosphere of mars , spectroscopy , surface pressure , isotopologue , chemistry , spectral line , materials science , physics , martian , optics , astrobiology , thermodynamics , meteorology , chromatography , quantum mechanics , astronomy
Experimental measurements of collision‐induced absorption (CIA) cross sections for CO 2 ‐H 2 and CO 2 ‐CH 4 complexes were performed using Fourier transform spectroscopy over a spectral range of 150–475 cm −1 and a temperature range of 200–300 K. These experimentally derived CIA cross sections agree with the spectral range of the calculation by Wordsworth et al. (2017) however, the amplitude is half of what was predicted. Furthermore, the CIA cross sections reported here agree with those measured by Turbet et al. (2019, 2019). Additionally, radiative transfer calculations of the early Mars atmosphere were performed, and showed that CO 2 ‐CH 4 CIA would require surface pressure greater than 3 bar for a 10% methane atmosphere to achieve 273 K at the surface. For CO 2 ‐H 2 , liquid water is possible with 5% hydrogen and less than 2 bar of surface pressure.