Abstract

The effect of decreasing the cross sections of electron capture by phosphorus (P5+) ions penetrating through gaseous media has been revealed experimentally. This effect is a violation of the known uniform dependence between the electron-capture cross section and the ion charge. Such an anomaly was not observed in measurements performed with argon ions under the same conditions. A possible reason of decreasing the cross sections of electron capture by P5+ ions may be autoionization of excited P4+ ions. The latter are formed during electron capture into excited states by metastable particles of a beam of P5+ ions.

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