The GEISA 2020 sub-database on line transition parameters

The GEISA 2020 sub-database of line transition parameters involves 58 molecules (145 isotopic species) and contains 6,746,982 entries, in the spectral range from 10^-6 to 35,877.030506 cm-1.

       

The GEISA molecules are constituents of the atmospheres of Earth (major permanent and trace molecules) and of other Planets (such as: C₂H₄, GeH₄, C₃H₈, C₂N₂, C₄H₂, HC₃N, H₂S, HCOOH and C₃H₄/H₂C₃H₂, for the Giant Planets).

In this version, 20 molecules have been updated (with 12 new isotopic species) and 6 new molecules have been added (HONO, COFCl, CH₃F, CH₃I, RuO₄, H₂C₃H₂ (isomer of C₃H₄)) corresponding to 15 isotopic species.

             

                   

Among the 31 spectroscopic parameters archived in GEISA, the most important for atmospheric radiative transfer modelling are: the wavenumber (cm-1) of the line associated with a vibro-rotational transition, the intensity of the line (cm molecule-1 at 296K), the Lorentzian collision halfwidth (cm-1 atm-1 at 296 K), with associated self – pressure broadening parameter, the energy of the lower level of the transition (cm-1), the transition quantum identifications for the lower and upper levels of the transition, the temperature dependence coefficient of the halfwidth, the database management identification codes for isotopologues and for molecules.

• Overall description of available vibrational transitions in GEISA 2020
• Update details