Počet záznamů: 1

The decay mechanism of photoexcited guanine - A nonadiabatic dynamics study

  1. 1.
    0364667 - UOCHB-X 2012 RIV US eng J - Článek v odborném periodiku
    Barbatti, M. - Szymczak, J. J. - Aquino, A. J. A. - Nachtigallová, Dana - Lischka, H.
    The decay mechanism of photoexcited guanine - A nonadiabatic dynamics study.
    Journal of Chemical Physics. Roč. 134, č. 1 (2011), 14304/1-14304/5 ISSN 0021-9606
    Grant CEP: GA MŠk LC512
    Výzkumný záměr: CEZ:AV0Z40550506
    Klíčová slova: ab initio calculations * excited states * nucleic acids * photodynamics
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.333, rok: 2011

    Ab initio surface hopping dynamics calculations were performed for the biologically relevant tautomer of guanine in gas phase excited into the first .pi.pi.* state. The results show that the complete population of UV-excited molecules returns to the ground state following an exponential decay within -220 fs. This value is in good agreement with the experimentally obtained decay times of 148 and 360 fs. No fraction of the population remains trapped in the excited states. The internal conversion occurs in the ππ*state at two related types of conical intersections strongly puckered at the C2 atom. Only a small population of about 5% following an alternative pathway via a .pi.pi.* state was found in the dynamics.
    Trvalý link: http://hdl.handle.net/11104/0200091