GEISA format description

GEISA format for line transition parameters 

The format of each entry is described in the following Table 1.

A reader in Fortran is available here.

Each entry is a 252 character record to describe the 31 spectroscopic line parameters.

First line of Table 1: the 31 Spectroscopic line parameters are listed in the 31 columns and their description is given below. Line 2 and line 3 display the field length and the FORTAN format descriptor, respectively. Line 4 displays the standard default values associated to each parameter. Line 5 displays a cumulative index indicating the position of the last character of the record associated to each of the 31 spectroscopic line parameters.

• The standard default values for fields «O’», « T » and « T’ », have been set to “zero”. These modifications, since the GEISA-2011 edition, were made to avoid potential misunderstanding and thus improper use of these parameters in some applications especially related to forward radiative transfer.

It has to be noted that:

• Fields E1, E2, E3, E4 correspond to the rovibrational identification parameters
• Fields K and L (high-lightened in grey) are HITRAN specific for the users’ easier possible interface between the two databases.
• Value in field M is given only if directly provided by the author of the spectroscopic line entry.

Table -1-

• A : wave number (cm^-1) of the line
• B : intensity of the line in (cm^-1/(molecule.cm^-2) at 296K
• C : Air broadening pressure halfwidth (HWHM) (cm^-1atm^-1) at 296K
• D : Energy of the lower transition level (cm^-1)
• Ei (i=1,2,3,4) : Transition quantum identifications for the lower and upper state of the transition
  • E1 : upper state vibrational identification
  • E2 : lower state vibrational identification
  • E3 : upper state rotationnal identification
  • E4 : lower state rotationnal identification
• F : temperature dependence coefficient n of the air broadening halfwidth
• G : identification code for isotopologue as in GEISA
• I : identification code for molecule as in GEISA
• J : Internal GEISA code for the data identification
• K : Molecule number as in HITRAN
• L : isotopologue number (1=most abundant, 2= second…etc) as in HITRAN
• M : Einstein A-coefficient
• N : self broadening pressure halfwidth (HWHMself) (cm^-1atm^-1) at 296K
• O : air pressure shift of the line transition (cm^-1) at 296K
• R : temperature dependence coefficient of the air pressure shift
• A’ : estimated accuracy (cm^-1) on the line position
• B’ : estimated accuracy on the intensity of the line in (cm^-1/(molecule.cm^-2)
• C’ : estimated accuracy on the air collision halfwidth (HWHM) (cm^-1atm^-1)
• F’ : estimated accuracy on the temperature dependence coefficient of the air-broadening halfwidth
• O’ : estimated accuracy on the air pressure shift of the line transition (cm^-1) at 296K
• R’ : estimated accuracy on the temperature dependence coefficient of the air pressure shift
• N’ : estimated accuracy on the self-broadened (HWHM) (cm^-1atm^-1) at 296K
• S : temperature dependence coefficient of the self-broadening halfwidth
• S’ : estimated accuracy on the temperature dependence coefficient of the self-broadening halfwidth
• T : self-pressure shift of the line transition (cm^-1) at 296K
• T’ : estimated accuracy on the self-pressure shift of the line transition (cm^-1) at 296K
• U : temperature dependence coefficient of the self-pressure shift
• U’ : estimated accuracy on the temperature dependence coefficient of the self-pressure shift

As shown in line 4 of Table 1- GEISA undefined values are attributed to the line parameter entries when no value is available from the data provider (missing data).

Fortran data reader.