Pressure Effects of Foreign Gases on the Absorption Lines of Cesium. II. The Effects of Helium on the First Two Members of the Principal Series

Abstract

Cs(1)/He and Cs(2)/He measurements are reported up to 300 and 20 atmospheres, respectively. The shift curves for Cs(1)/He are linear up to a point and then very abruptly change to a new linear region. Half-width curves are all observed to be nonlinear at low pressures. In addition, the half-widths of helium-broadened cesium lines are shown to have a strong temperature dependence, at least as strong as the first power of temperature. There is very little or no temperature effect on the shift within our temperature and pressure range of experimental observations, viz. 40°C-160°C and relative density 0-190 for Cs(1)/He, and 98°C-177°C, and relative density 0-13 for Cs(2)/He.