Broadening and Shift of the Second Doublet of the Rubidium Absorption Series Under Different Pressures of Argon and Helium

Abstract

The shift and broadening of the second doublet of the principal series of rubidium produced by argon and by helium were studied for pressures up to 123.5 atmospheres (rd 52) and up to 97.5 atmospheres (rd 44), respectively. The red shift produced by argon gives a linear relationship with its relative density, rd. The slopes for both components of the doublet are 2.95 ${\mathrm{cm}}^{-1\mathrm{}}$/rd. The violet shift produced by helium in the high pressure range is greater than linear with the rd. The ${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ component is shifted more than the ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ component.