Photodissociation dynamics of pyrimidine
- Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan (China)
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 C{sub 4}N{sub 2}H{sub 4}{yields}C{sub 4}N{sub 2}H{sub 3}+H and five ring opening dissociation channels, C{sub 4}N{sub 2}H{sub 4}{yields}C{sub 3}NH{sub 3}+HCN, C{sub 4}N{sub 2}H{sub 4}{yields}2C{sub 2}NH{sub 2}, C{sub 4}N{sub 2}H{sub 4}{yields}CH{sub 3}N+C{sub 3}NH, C{sub 4}N{sub 2}H{sub 4}{yields}C{sub 4}NH{sub 2}+NH{sub 2}, and C{sub 4}N{sub 2}H{sub 4}{yields}CH{sub 2}N+C{sub 3}NH{sub 2}. 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 >5x10{sup 7} and 1x10{sup 6} s{sup -1} at 193 and 248 nm, respectively. Comparison with the potential energies from ab initio calculations have been made.
- OSTI ID:
- 20783236
- Journal Information:
- Journal of Chemical Physics, Vol. 124, Issue 8; Other Information: DOI: 10.1063/1.2174011; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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