Abstract
The ejection of hydrated electrons from 266-nm laser-photoexcited solutions containing Cu(NH3)+3, CuCl2−3, or CuBr2−3 occurs through two pathways on the nanosecond time scale: a prompt ejection (τ<laser pulsewidth), and a delayed ejection (τ>laser pulsewidth) which follows a first-order rate law. This behavior is consistent with electron ejection from two excited states: the primary CTTS state, and longer-lived triplet species consisting of an exciplex and its precursor. The quantum yields for both prompt and delayed ejection are quite high, in the 0.15–0.4 range.
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