Atomic Processes in Highly Ionized Xenon Plasmas Radiating Between 2.5 and 14Å*

We present a study of highly ionized xenon plasmas radiating between 2.5 and 14 Å. Comparison of x-ray line emission to non-local thermodynamic equilibrium (non-LTE) modeling provides an understanding of laboratory produced plasmas and underlying atomic processes. A new M-shell Xe non-LTE model was constructed using atomic data from the FAC to describe x-ray line emission from Xe gas-puff Z-pinch experiments. Notable results include a robust description of emission lines arising from ionization stages Zn-like to Ti-like. Expanding upon this work, we conducted a theoretical study of L-shell Xe and the effects of x-ray line polarization. In particular, we studied the polarization-dependent spectra of Na-like Xe influenced by electron beams and tested the trend towards a maximum negative polarization for large J-values. Many previous x-ray line polarization studies consider only K-shell radiation; this work focuses on L-shell radiation which is more complex to analyze due to the significant increase in number of ionization stages. Applications of this polarization work are relevant for understanding the dielectronic recombination atomic process in L-shell highly charged ions plasmas with anisotropic particle distributions such as non-thermal electron beams and for their diagnostics.