Pressure Effects of Rare Gases on the Absorption Line Ca4227. I. The Effects of Argon and Helium
Phys. Rev. A 3, 946 – Published 1 March, 1971
DOI: https://doi.org/10.1103/PhysRevA.3.946
Abstract
The shift, broadening, and line shape of the absorption line Ca 4227 in the presence of Ar and He were observed under a wide range of pressures. The relative densities (rd) employed extended from 1 to about 245 (15 450 psi at 638 °C) for Ar and to 58 (2563 psi at 638 °C) for He. Both Ar and He produce a red shift, -0.019 /rd for He and -0.023 /rd for Ar. The dependence of the half-width on rd appears to adhere to linearity less than does the dependence of the shift on the rd. The broadening at low rd (<10) is 0.64 /rd for He and 0.74 /rd for Ar. Some typical intensity profiles are given showing also the presence of a very extended blue wing due to He and a broad violet satellite due to Ar.