Collisional Broadening of the Na-D Lines by MolecularGases

Abstract

The experimental investigations devoted to the Na-D spectral linebroadening by molecular gases are reviewed. The theoreticalinterpretation of the data within the framework of the classicaltheory of atomic spectral line broadening is given. The effect ofadiabatic and diabatic collisions on the shape of both impact andquasi-static spectral-line wings is discussed. The different forms ofspectral-line shape representation and the connections between themare considered. The experimental cross-sections of the Lorentzianbroadening of the Na-D lines by molecules are presented and comparedwith the theoretical ones. The problem of restoration of the adiabaticinteraction potentials from quasi-static wing profiles is noted. TheC6, C12 parameters of theeffective atom-molecular potentials of the Lennard-Jones 12-6 form,restored on quasi-static wing profiles, are presented.