title: Nonradiative deexcitation dynamics of 9H-adenine: an OM2 surface hopping study.
abstract: The nonradiative relaxation of 9H-adenine was studied at the semiempirical OM2/MR-CI level using the surface-hopping approach. Geometry optimizations of energy minima and conical intersections as well as single-point calculations of excitation energies at critical points were performed to characterize the relevant potential energy surfaces of 9H-adenine and to assess the accuracy of the OM2 results. Surface-hopping calculations were performed to describe the nonradiative dynamics of 9H-adenine after vertical excitation into the optically active state. They showed that the deexcitation process is mainly governed by a two-step relaxation consisting of an ultrashort component and a longer component. These findings compare well with experimental results from time-resolved photoelectron spectroscopy.
authors.affiliation: Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Fabiano
authors.forename: W
authors.initials: W
authors.lastname: Thiel
mesh_terms: D000225:Adenine / Q000737:chemistry*; D007834:Lasers; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008968:Molecular Conformation; D015394:Molecular Structure; D009696:Nucleic Acids / Q000737:chemistry; D046590:Spectroscopy, Electron Energy-Loss
chemical_list: D009696:Nucleic Acids; D000225:Adenine