Abstract
Line profiles for hydrogen including the case of dense plasmas are investigated on the basis of a many-particle approach. Using a Green’s-function technique, electron contributions to the shift and broadening from both separate-level and interferencelike terms are considered consistently. The theoretical approach to the line profile has been improved by including dynamic screening of collisions, contributions from Δn=0 transitions, and cross-term contributions not only to the broadening but also to the shift of the line. As an example, the line profile of has been considered. An analysis of details of the second-order approximation with respect to the atom-plasma interaction is given, avoiding the no-quenching and dipole approximations. The effect of dynamic screening for high electron densities is investigated. Deviations from the linear dependence between the electron-shift contribution and the density are expected for for ≥2× at temperatures of about 10 000 K.
- Received 9 April 1991
DOI:https://doi.org/10.1103/PhysRevA.44.6834
©1991 American Physical Society