Spectral analysis of x-ray emission created by intense laser irradiation of copper materials

Abstract

We have measured the x-ray emission, primarily from Kα,Kβ, and Heα lines, of elemental copper foil and “foam” targets irradiated with a mid-1016 W/cm2 laser pulse. The copper foam at 0.1 times solid density is observed to produce 50% greater Heα line emission than copper foil, and the measured signal is well-fit by a sum of three synthetic spectra generated by the atomic physics code FLYCHK. Additionally, spectra from both targets reveal characteristic inner shell Kα transitions from hot electron interaction with the bulk copper. However, only the larger-volume foam target produced significant Kβ radiation, confirming a lower bulk temperature in the higher volume sample.

A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma

“…In our study, the x-ray spectrum was recorded with a time integrated x-ray spectrograph. The observed x-ray spectrum corresponds to the time and space averaged values of density and temperature of the plasma undergoing rapid hydrodynamic evolution [40,41]. Modelling the x-ray spectrum at each distinct condition of temperature and density, in space and time, would require sophisticated computer simulations coupled to plasma hydrodynamic codes including radiation transport.…”

Anomalous Anisotropic Nanoparticle Aggregation in Cu2(OH)3Br Gels

“…In particular, Cu II aerogels are useful as precursors for nanoporous Cu metal monoliths . Such nanoporous metals have potential use as porous electrodes, , catalyst supports, X-ray beam spreaders, and various components for high-energy-density physics experiments. , However, Cu II aerogels have been historically elusive. They were only first demonstrated in 2008 via epoxide-assisted gelation .…”