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- W2132821561 abstract "Imidazole acts as a subunit in the DNA base adenine and the amino acid histidine-both important biomolecules which display low fluorescence quantum yields following UV excitation. The low fluorescence quantum yields are attributed to competing non-radiative excited state relaxation pathways that operate on ultrafast timescales. Imidazole is investigated here as a model compound due to its accessibility to high level ab initio calculations and time-resolved gas-phase spectroscopic techniques. Recent non-adiabatic dynamics simulations have identified three non-radiative relaxation mechanisms which are active following 6.0-6.2 eV excitation. Presented herein is a comprehensive investigation of each mechanism using a combination of femtosecond time-resolved ion yield and total kinetic energy release spectroscopies to monitor the formation of associated photoproducts. Relaxation along the (1)πσ state constitutes the predominant deactivation pathway. Timescales for NH-dissociation are extracted and distinguished from alternative H-atom sources based on their kinetic energy distributions. Larger photoproducts are observed to a lesser extent and attributed to ring fragmentation following NH-puckering and CN-stretching relaxation paths." @default.
- W2132821561 created "2016-06-24" @default.
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- W2132821561 creator A5024661346 @default.
- W2132821561 creator A5024895838 @default.
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- W2132821561 date "2012-01-01" @default.
- W2132821561 modified "2023-10-05" @default.
- W2132821561 title "Investigation of multiple electronic excited state relaxation pathways following 200 nm photolysis of gas-phase imidazole" @default.
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- W2132821561 doi "https://doi.org/10.1039/c2cp23533a" @default.
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