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Transient UV-visible absorption difference spectrum of a deaerated acetonitrile solution containing 1.0 × 10–4 mol·liter–1 16+ and 5.0 × 10–5 mol·liter–1 ptz, recorded 50 μs after 532-nm laser excitation at room temperature. (Inset) Normalized transient absorption decays monitored at 520 (solid line) and 600 (dotted line) nm, which correspond to signals assigned to ptz+ and 
, respectively.
