Abstract

We present relative cross section measurements of the inner-shell ionization of highly charged chromium ions by high-energy (7–30 keV) electrons. The measurements use a technique based on high-resolution X-ray spectroscopy, which correlates ionization events with Kα decay X-rays. Moreover, the measurements show that inner-shell ionization only affects the strength of the heliumlike 1s2s 3S1 → 1s2 1S0 forbidden line. The cross sections inferred for Li-like Cr21+ agree well with distorted wave calculations.

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