Spectral Line Broadening in Dense Plasmas

Abstract

Spectral line broadening is calculated based on a microscopic quantum statistical approach. By using thermodynamic Green's function, plasma correlation effect, electrostatic and dynamic screening, and perturber-radiator interaction are taken into account. Ions are treated in quasistatic approximation due to Stark effect. The line broadening for 6678 Å (2 1 P-3 1 D) and 5016 Å (2 1 S-3 1 P) transitions of neutral helium is calculated in the electron density range n e = ( 0.25 – 50 ) × 1 0 22 m - 3 and temperature range T = ( 0.5 – 4 ) × 1 0 4 K , and the density and temperature dependence of the line width are investigated. A good agreement is shown by comparing the calculated values with the existing experimental and theoretical data.