Pressure Effects of Foreign Gases on the Absorption Lines of Cesium. IV. The Effects of Neon

Abstract

The effect of Ne on the fine-structure components of the first four members of the Cs principal series is described. Less detailed information is provided for higher series members up to Cs(20)/Ne, with the emphasis on the shift of the ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ component. Both components of Cs(1)/Ne shift toward the red for relative density (r.d.)${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ component shifts to the violet. For Cs(2)/Ne the ${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ component has almost zero slope initially and shifts to the violet. The ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ component shifts to the red initially, but above r.d.=14 it is also violet-shifted. The Cs(2)/Ne shift curves are both linear above r.d.=25. Both components of all higher members are observed to be violet-shifted in all regions, with fine-structure effects becoming less apparent. Half-widths are observed to be nonlinear with density in all regions studied. Temperature effects are described for Cs(1)/Ne and Cs(2)/Ne, with an increase in temperature causing a large increase in violet shift (or decrease in red shift) at low pressures. The possible existence of a violet satellite for the long-wavelength component of Cs(2)/Ne as well as the short-wavelength component is reported.