Abstract
Charge stripping experiments indicate that in the reaction M + → M 2 + e − the doublycharged transition-metal ions M 2+ (M = Fe, Co, Ni) are formed in excited states. Introduction of one or two C 5H 5 ligands drastically reduces the Q min values of the reaction M(C 5H 5) + x → M(C 5H 5) 2+) x + e − (x = 1, 2) by at least 3.5 eV. The experimental findings support existing molecular orbital concepts of metallocene compounds.
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