Strong higher-order resonant contributions to x-ray line polarization in hot plasmas.
basic_science · Level V
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- Record sourced from PubMed, PMID 27415199.
- Also identified by DOI 10.1103/PhysRevE.93.061201.
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Abstract
We studied angular distributions of x rays emitted in resonant recombination of highly charged iron and krypton ions, resolving dielectronic, trielectronic, and quadruelectronic channels. A tunable electron beam drove these processes, inducing x rays registered by two detectors mounted along and perpendicular to the beam axis. The measured emission asymmetries comprehensively benchmarked full-order atomic calculations. We conclude that accurate polarization diagnostics of hot plasmas can only be obtained under the premise of inclusion of higher-order processes that were neglected in earlier work.