Temperature and density dependence of Kr L-shell spectrum in hot dense plasmas

Abstract

Kr L-shell spectroscopy modeling results are discussed in this paper, focusing on the n = 4 to n = 2 line transitions of Be- and Li-like Kr ions. Collisional radiative atomic kinetic and Stark-broadened spectral line shape calculations show electron temperature T (e )and density n (e) sensitivity in the spectrum. The combination of the T e dependence due to the relative intensity of Be-like to Li-like line emissions in the range from 1.5 to 3 keV and the n e sensitivity from the Stark broadening effect on the line shapes in the range from 5 x 10( 23 )to 2 x 10 (24) / cc results in a spectrum that can be employed to diagnose T e and n e. Two different collisional radiative atomic kinetic models i.e., Prismspect [J. J. MacFarlane, et al., Int. Fusion Sci. Appl. Conf. Proc. 457 (2003)] and ABAKO [Florido, et al., PRE, 80, 056402 (2009)] produce similar results in level populations and spectra. In x-ray spectroscopy of implosion cores, this Kr L-shell spectrum may prove useful in an intermediate T e range in which Ar is too ionized for its K-shell to be of diagnostic value and Kr is not ionized enough for its K-shell emission to be useful.