Modifications of the Cs Absorption Spectrum Due to Interatomic Interactions

Abstract

Absorption spectra of Cs in the presence of H₂, D₂, N₂, He, Ne, A, Kr, Xe, methane, ethane, propane, n‐butane, n‐pentane, n‐hexane, n‐heptane, n‐octane, and benzene were investigated following a similar work with Rb. It was found that the spectra of all these mixtures of Cs and foreign gas exhibit diffuse bands in the neighborhood of certain Cs atomic lines. Over one‐hundred such bands were identified, the positions of the bands were measured, and some of the regularities in the occurrence of the bands were determined. The results of this investigation in general were found to be in qualitative agreement with the statistical theory of pressure broadening of the atomic lines if both the attractive and the repulsive interatomic forces are taken into account. It is, however, not certain that the statistical theory is capable of explaining the observed phenomena in their entirety.