RFM Driver Table Sections

*SHP Section: Molecular Lineshapes

08SEP05
Type
Secondary Section - depends on SHP Flag.

Description
User-defined (ie non-Voigt) spectral line shapes.

Format
Multiple records, arbitrary order
Record structure: SHPNAM GAS(1) GAS(2) ... GAS(N)
FieldTypeDescription
SHPNAM C*3 Lineshape to be used
GAS C*7 Molecule to which lineshape is applied, or '*'
Allowed values for SHPNAM
FieldDescription
VOI Voigt Lineshape
LOR Lorentz Lineshape
DOP Doppler Lineshape
VVW or VAN Van Vleck Weisskopf Lineshape
CHI Voigt plus Chi-factor

Notes
  1. Only the first 3 characters of SHPNAM are tested so, for example, LORENTZ can be used for LOR.
  2. An asterisk (*) may be substituted for GAS once in this section, in which case it is taken to represent all required gases not explicitly allocated other shapes.
  3. If no asterisk is present, all absorbers must be explicitly allocated a lineshape.
  4. Currently the CHI shape can only be used with CO2 (represents sub-Lorentzian wings of CO2).
  5. The VVW lineshape specified here is an explicit calculation of the Van Vleck Weisskopf lineshape, i.e., the Lorentz lineshape with low-wavenumber correction terms (recommended for calculations in microwave region).
  6. The VVW Flag can be used for applying the same correction all lineshapes, i.e. VVW lineshape specified in this section is equivalent to LOR lineshape + VVW Flag.
  7. If both the VVW Flag and VVW lineshape are specified, a warning is generated but the VVW correction is ignored for lines already generated with the VVW lineshape.

Example 
*SHP
     Chi-factor  CO2    ! Use CO2 sub-Lorentzian wings 
     LORENTZ  H2O CH4   ! Use Lorentz shape for H2O and CH4
     LORENTZ  N2O       ! Also N2O
     VOI         *      ! Use Voigt shape for all other absorbers
     DOPP CO            ! Doppler shape for CO

Bugs
[none reported]