Abstract
A prompt, long-lived, and red fluorescence has been observed in the photodissociation of the jet-cooled diazirine (H 2CN 2) excited at the origin (322.96 nm) of the S 1←S 0 transition. The fluorescence decays (∼16 μs) and range (>575 nm) indicate that the emitting species is the electronically excited singlet methylene, CH 2 (b̃ 1B 1). The linear dependence of the fluorescence intensity on the photolysis laser power strongly supports that the fluorescing CH 2 (b̃ 1B 1) is produced directly from the first excited singlet state of diazirine. The observation that the fluorescence appears in the visible wavelength region indicates that the CH 2 (b̃ 1B 1) fragments are highly vibrationally excited.
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