Description
Title: A comparison of the results from MERL and molecular dynamics simulations of the Stark-Broadening of Ar K-Shell Lines
Abstract: To determine the electron density of high-energy density plasmas, a potent, non-invasive diagnostic technique is the analysis of Stark-broadened spectral line profiles. New studies on line broadening theory calculations, computer simulations, and their comparison have been stimulated by the growing number of applications and accessibility of spectroscopic measurements. Here, we discuss a comparison of Stark-broadened line shapes computed by multi-electron radiator line shape (MERL) code and computer simulations of non-interacting and interacting particles. We pay special attention to the transitions of the Ar K-shell in He- and H-like ions, specifically Hea, Heb, and Heg in He-like Ar and Lya, Lyb, and Lyg in H-like Ar. These lines have been extensively used in indirect- and direct-drive inertial confinement fusion (ICF) experiments for X-ray spectroscopy of Ar-doped implosion cores. The calculations were performed using electron densities of 1023 to 3 1024 cm3 and an electron temperature of 1 keV as a representative value. Comparisons between complete line profiles with effects from both electron and ion broadening as well as Doppler and electron broadening alone are presented. Overall, MERL line shapes are narrower than those from computer simulations of independent and interacting particles carried out under the same circumstances. Differences result from unique electron broadening treatments and are more obvious in line transitions.
Keywords: stark broadening; electron broadening; recombination broadening; simulations; molecular dynamics
Paper Quality: SCOPUS / Web of Science Level Research Paper
Subject: Physics
Subject Category: Atomic and Molecular Physics, and Optics
Writer Experience: 20+ Years
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