In the course of conducting laser-target interaction experiments at 20-ps pulse length using Al and Mg targets, to determine the ionization balance of these elements, time-resolved K-shell spectral line strengths were obtained, suggesting population inversions between excited levels in both He-like and H-like ions. Effects of resonance-line opacities need to be analyzed in more detail, but opacity effects alone do not account for the anomalous line-intensity ratios that are observed to persist 200–300 ps after the laser pulse. Comparisons with 50-ps and 100-ps pulse shots do not show evidence of inversion, although nonequilibrium spectral lineintensity distributions are observed.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the Optical Society of America B: Optical Physics|
|State||Published - 1992|
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Atomic and Molecular Physics, and Optics