The Lyα1/Lyα2 doublet ratio of H-like ions is proposed and demonstrated as a plasma column density diagnostic, decreasing from 2 to 1 as column density increases from about 1e20 to 1e24 cm^-2.
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New Insights with XRISM & Cloudy: A novel Column Density Diagnostic
The Lyα1/Lyα2 doublet ratio of H-like ions is proposed and demonstrated as a plasma column density diagnostic, decreasing from 2 to 1 as column density increases from about 1e20 to 1e24 cm^-2.