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Improvement of the spectroscopic parameters of the air- and self-broadened N2O and CO lines for the HITRAN2020 database applications

Published

Author(s)

Robab Hashemi, Iouli Gordon, Erin Adkins, Joseph T. Hodges, Manfred Birk, David Long, Chris Boone, Adam Fleisher, Adriana Predoi-Cross, Laurence Rothman

Abstract

This paper outlines the major update of the line-shape parameters that were performed for the nitrous oxide (N2O) and carbon monoxide (CO) molecules listed in the HITRAN2020 database. We reviewed the collected measurements for the air- and self-broadened N2O and CO spectra to determine proper values for the spectroscopic parameters. Careful comparisons of broadening parameters using the Voigt and speed-dependent Voigt line-shape pro les were performed among various published results for both N2O and CO. Selected data allowed for developing semi-empirical models, which were used to extrapolate/interpolate existing data to update broadening parameters of all the lines of these molecules in the HITRAN database. In addition to the line broadening parameters (and their temperature dependences), the pressure shift values were revised for N2O and CO broadened by air and self for all the bands. The air and self speed dependence of the broadening parameter for these two molecules were added for every transition as well. Furthermore, we determined the 1st-order line- mixing parameters using the Exponential Power Gap (EPG) scaling law. The new line-shape parameters were evaluated using the laboratory and atmospheric measurements.
Citation
Journal of Quantitative Spectroscopy and Radiative Transfer

Keywords

HITRAN database, N2O, CO, line-shape parameters, air- and self-broadening, speed-dependent parameter, EPG calculation, 1st-order line-mixing, Pade approximants

Citation

Hashemi, R. , Gordon, I. , Adkins, E. , , J. , Birk, M. , Long, D. , Boone, C. , Fleisher, A. , Predoi-Cross, A. and Rothman, L. (2021), Improvement of the spectroscopic parameters of the air- and self-broadened N2O and CO lines for the HITRAN2020 database applications, Journal of Quantitative Spectroscopy and Radiative Transfer, [online], https://doi.org/10.1016/j.jqsrt.2021.107735, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932176 (Accessed July 27, 2021)
Created June 11, 2021, Updated June 17, 2021