Approximate spectral absorption coefficient calculations for electronic band systems belonging to diatomic molecules

Abstract

The spectral absorption coefficients in electronic band systems of diatomic emitters have been computed in the past by models that may be described as 'the just overlapping line model' and a model 'utilizing a smeared out rotational structure'. Although the basic relations are obtained by utilizing somewhat different physical arguments, the resulting equations are, in fact, identical. Spectral absorption coefficients have been calculated for the NO γ-bands at 2000ºK by using the approximate theoretical relations. The calculated results are in good agreement with estimates derived by numerical calculations in which, however, the absorption coefficient data were averaged over intervals of 2000 cm^(-1).