期刊
CHEMPHYSCHEM
卷 10, 期 8, 页码 1225-1229出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200900030
关键词
conical intersections; femtochemistry; molecular dynamics; nucleobases; semiempirical calculations
资金
- Deutsche Forschungsgemeinschaft [SFB 663]
- ERC-Starting Grant FP7-Project DEDOM [207441]
The photoinduced nonadiabatic decay dynamics of 9H-guanine is investigated by surface-hopping calculations at the semiempirical OM2/MRCI level of theory. Following excitation, fast internal conversion from the pi pi* (L.) excited state to the ground state is observed within 800 fs. Relaxation proceeds through two distinct S-1 -> S-0 pathways. The first channel goes through a conical intersection with pronounced out-of-plane displacement of the C2 atom and yields ultrafast decay with a time constant of 190 fs. The second channel evolves through a conical intersection with strong out-of-plane distortion of the amino group and leads to slower decay with a lifetime of 400 fs. These decay mechanisms and the computed decay times are consistent with the available experimental evidence and previous theoretical studies.
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