Partition sums for non-local thermodynamic equilibrium conditions for nine molecules of importance in planetary atmospheres

Robert R. Gamache, Bastien Vispoel, Michaël Rey, Vladimir Tyuterev, Alain Barbe, Andrei Nikitin, Oleg L. Polyansky, Jonathan Tennyson, Sergei N. Yurchenko, Attila G. Császár, Tibor Furtenbacher, Valery I. Perevalov, Sergei A. Tashkun

Research output: Contribution to journalArticlepeer-review

Abstract

Internal vibrational and rotational partition functions are calculated for nine molecules that are abundant in the terrestrial atmosphere and some are also observed in planetary and exoplanet atmospheres. These molecules are often observed in non-local thermodynamic equilibrium (NLTE) conditions. Calculations are made for all isotopologues of these molecules for which data are available, generally for the temperature range T = 1–5000 K. The methods of calculation of the vibrational and rotational partition functions, Qv and Qr, respectively, the convergence, and the uncertainties for each isotopologue are discussed. Finally, a FORTRAN program, NLTE_TIPS_2021.FOR, to recall the NLTE partition sums is discussed.

Original languageEnglish
Article number114947
JournalIcarus
Volume378
DOIs
Publication statusPublished - 15 May 2022

Keywords

  • NLTE
  • Partition sums
  • Planetary and exoplanet atmospheres

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