Finite-temperature random-phase approximation for spectroscopic properties of neon plasmas

A finite-temperature random-phase approximation (FTRPA) is applied to calculate oscillator strengths for excitations in hot and dense plasmas. Application of the FTRPA provides a convenient, self-consistent method with which to explore coupled-channel effects of excited electrons in a dense plasma. We present FTRPA calculations that include coupled-channel effects. The inclusion of these effects is shown to cause significant differences in the oscillator strength for a prototypical case of P-1 excitation in neon when compared with single-channel and with average-atom calculations. Trends as a function of temperature and density are also discussed.