2 research outputs found
Leading spectral moments for easy computation of pressure effects on rotational lines
International audienceExplicit classicalâlimit formulae for two leading spectral moments characterizing the anisotropy of the interaction potential are derived for fast collisions of linear rotators in the binary regime. With the help of these moments, model Fourierâtransforms of the timeâcorrelation functions comprising nonâMarkovian effects are restored, which enables a novel and straight approach to pressure transformation of broad spectral bands and pressureâbroadening characteristics of (vib)rotational spectral lines, as demonstrated on a simple Markovâlimit example of isotropic and anisotropic Raman line widths of molecular nitrogen