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

Publisher Website
Google Scholar
Abstract
The effect of Ar on both fine-structure components of the first two members of the Cs principal series is described. Experimental procedures are outlined. Cs(1)/Ar and Cs(2)/Ar measurements are reported up to 300 and 30 atmospheres, respectively. Special emphasis was given to obtaining precise data in the low-pressure region. This emphasis revealed structure heretofore unsuspected. In particular, the plot of half-widths versus argon density is nonlinear at low pressures, in contradiction to the present theory. Also, it is found that similar plots for shifts, although linear initially, deviate sharply from the original line at quite low pressures. After a transition region the shift curves are all observed to have a second linear region. The observed anomalous shift and broadening may be due to the effect of unresolved satellite bands of the lines.