Photodissociation dynamics of tryptophan and the implication of asymmetric photolysis

Chien-Ming Tseng*, Yuri A. Dyakov, Huai Ching Huang, Kuan Yu Huang, Yuan T. Lee, Chi Kung Ni, Su Yu Chiang

*Corresponding author for this work

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Abstract

Photodissociation of amino acid tryptophan in a molecular beam at wavelengths of 212.8 and 193 nm, corresponding to excitation to the second and third absorption bands, was investigated using multimass ion imaging techniques. The respective wavelengths also represent excitation to the edge of a positive circular dichroism band and the center of a negative circular dichroism band of L-tryptophan. Only one dissociation channel was observed at both photolysis wavelengths: C8 NH6 CH2 CHNH2 COOH→ C8 NH6 CH2 + CHNH2 COOH. Dissociation rates were found to be 1.3× 106 and 5× 106 s-1 at the respective wavelengths. Comparison to theoretical calculation indicates that dissociation occurs on the ground state after internal conversion. Implication of asymmetric photolysis is discussed.

Original languageEnglish
Article number074307
JournalJournal of Chemical Physics
Volume133
Issue number7
DOIs
StatePublished - 21 Aug 2010

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    Tseng, C-M., Dyakov, Y. A., Huang, H. C., Huang, K. Y., Lee, Y. T., Ni, C. K., & Chiang, S. Y. (2010). Photodissociation dynamics of tryptophan and the implication of asymmetric photolysis. Journal of Chemical Physics, 133(7), [074307]. https://doi.org/10.1063/1.3474992