High resolution photofragment translational spectroscopy studies of the near ultraviolet photolysis of imidazole.
作者： Adam L Devine , Bríd Cronin , Michael GD Nix , Michael NR Ashfold , None
DOI: 10.1063/1.2364504
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摘要: The fragmentation dynamics of gas phase phenol molecules following excitation at many wavelengths in the range 279.145⩾λphot⩾206.00nm have been investigated by H Rydberg atom photofragment translational spectroscopy. Many total kinetic energy release (TKER) spectra so derived show structure, analysis which confirms importance O–H bond fission and reveals that resulting phenoxyl cofragments are formed a very limited subset their available vibrational state density. Spectra recorded λphot⩾248nm feature centered TKER ∼6500cm−1. These fragments, no recoil anisotropy, rationalized terms initial S1←S0 (π*←π) excitation, subsequent dissociation via two successive radiationless transitions: internal conversion to ground (S0) levels carrying sufficient stretch allow efficient transfer towards, passage around, conical intersection (CI) between S0 S2(π1σ*) potential surfaces (PESs) la...
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