OH cooling and mid-IR lines in ProDiMo¶

There are two options for the OH molecule, LTE using the HITRAN database and NLTE using the ExoMol database and a special expansion (see Atomic and Molecular Data OH).

The flags to use those features are:

.true.   ! OH_ExoMol            : OH NLTE cooling
.false.  ! OHrovib_LTE_cooling  : OH LTE using the Hitran database

which is the recommended default setting. To use the Hitran database for OH rovibrational cooling and mid-IR lines use:

.false.  ! OH_ExoMol            : OH NLTE cooling
.true.   ! OHrovib_LTE_cooling  : OH LTE using the Hitran database

assumes the population at LTE, which may not be achieved in the upper disk atmosphere where the OH mid-IR lines are generated.

At very high density, both methods converge to each other as shown in the figure below.