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VOLUME 61 (1995) | ISSUE 7 | PAGE 599
Double exchange between chromium ions in a KZnF3:Cr3+,Cr2+ crystal
Lines of absorption due to Cr2+-Cr3+ ion pairs have been observed in the optical spectrum of a KZnF3 crystal activated with chromium ions. The absorption is accompanied by the dynamic transfer of an electron from one chromium ion to the other through an intermediate fluorine ion (a double 180° exchange). For the first time, the jump integral for an eg electron has been determined directly from the temperature dependence of the integrated intensities of the lines: |iuJ = 1010±50 cm-1. © 1995 American Institute of Physics.