Photodissociation dynamics of pyrimidine

Ming Fu Lin, Yuri A. Dyakov, Chien-Ming Tseng, Alexander M. Mebel, Sheng Hsien Lin, Yuan T. Lee, Chi Kung Ni*

*Corresponding author for this work

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Photodissociation of pyrimidine at 193 and 248 nm was investigated separately using vacuum ultraviolet photoionization at 118.4 and 88.6 nm and multimass ion imaging techniques. Six dissociation channels were observed at 193 nm, including C4 N2 H4 → C4 N2 H3 +H and five ring opening dissociation channels, C4 N2 H4 → C3 N H3 +HCN, C4 N2 H4 →2 C2 N H2, C4 N2 H4 →C H3 N+ C3 NH, C4 N2 H4 → C4 N H2 +N H2, and C4 N2 H4 →C H2 N+ C3 N H2. Only the first four channels were observed at 248 nm. Photofragment translational energy distributions and dissociation rates indicate that dissociation occurs in the ground electronic state after internal conversion at both wavelengths. The dissociation rates were found to be > 5× 107 and 1× 106 s-1 at 193 and 248 nm, respectively. Comparison with the potential energies from ab initio calculations have been made.

Original languageEnglish
Article number084303
JournalJournal of Chemical Physics
Issue number8
StatePublished - 7 Mar 2006

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    Lin, M. F., Dyakov, Y. A., Tseng, C-M., Mebel, A. M., Lin, S. H., Lee, Y. T., & Ni, C. K. (2006). Photodissociation dynamics of pyrimidine. Journal of Chemical Physics, 124(8), [084303].