Investigation of the 2p3∕2−3d5∕2 line emission of Au53+–Au69+ for diagnosing high energy density plasmas

Abstract

Measurements of the $L$-shell emission of highly charged gold ions were made under controlled laboratory conditions using the SuperEBIT electron beam ion trap, allowing detailed spectral observations of lines from Fe-like ${\mathrm{Au}}^{53+}$ through Ne-like ${\mathrm{Au}}^{69+}$. Using atomic data from the Flexible Atomic Code, we have identified strong $3d_{5∕2}\to 2p_{3∕2}$ emission features that can be used to diagnose the charge state distribution in high energy density plasmas, such as those found in the laser entrance hole of hot hohlraum radiation sources. We provide collisional-radiative calculations of the average ion charge $⟨Z⟩$ as a function of temperature and density, which can be used to relate charge state distributions inferred from $3d_{5∕2}\to 2p_{3∕2}$ emission features to plasma conditions, and investigate the effects of plasma density on calculated $L$-shell Au emission spectra.