Comparison of the observed and calculated coherent forward scattering spectra of the 842.5 nm Ar I and 844.6 nm O I lines in a radio frequency glow discharge

The coherent forward scattering (CFS) spectra of 0 I 844.6 nm and Ar I 842.5 nm lines in a radio frequency (RF) glow discharge were measured using a CFS spectrometer that functions in the Faraday configuration with permanent double-ring magnets and a diode-laser source. A significant change in the CFS spectrum of the Ar 1842.5 nm line was observed when the partial pressures of argon in a He-Ar RF glow discharge were changed. Based on the theoretical calculations of the CFS spectra performed using Faraday functions, a comparison between the observed and calculated spectra was performed. The CFS line profile of O I 844.6 nm and changes in the Ar 842.5 nm CFS spectrum are explained by theoretical calculations. (C) 2017 Published by Elsevier B.V.