X-Ray Signature of Charge Exchange in the Spectra of L-Shell Iron Ions

Details X-Ray Signature of Charge Exchange in the Spectra of L-Shell Iron Ions X-Ray Signature of Charge Exchange in the Spectra of L-Shell Iron Ions

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...672..726b&link_type=abstract

The Astrophysical Journal, Volume 672, Issue 1, pp. 726-732.

Astronomy and Astrophysics

Astronomy

3

Atomic Data, Atomic Processes, Line: Formation, X-Rays: General

Scientific paper

The X-ray signature of charge exchange between highly charged L-shell iron ions and neutral gas atoms was studied in the laboratory in order to assess its diagnostic utility. Significant differences with spectra formed by electron-impact excitation were observed. In particular, a strong enhancement was found of the emission corresponding to n>=4-->n=2 transitions relative to the n=3-->n=2 emission. This enhancement was detectable even with relatively low-resolution X-ray instrumentation (E/ΔE~10) and may enable future identification of charge exchange as a line-formation mechanism in astrophysical spectra.

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