title: Benzophenone Ultrafast Triplet Population: Revisiting the Kinetic Model by Surface-Hopping Dynamics.
abstract: The photochemistry of benzophenone, a paradigmatic organic molecule for photosensitization, was investigated by means of surface-hopping ab initio molecular dynamics. Different mechanisms were found to be relevant within the first 600 fs after excitation; the long-debated direct (S1 → T1) and indirect (S1 → T2 → T1) mechanisms for population of the low-lying triplet state are both possible, with the latter being prevalent. Moreover, we established the existence of a kinetic equilibrium between the two triplet states, never observed before. This fact implies that a significant fraction of the overall population resides in T2, eventually allowing one to revisit the usual spectroscopic assignment proposed by transient absorption spectroscopy. This finding is of particular interest for photocatalysis as well as for DNA damages studies because both T1 and T2 channels are, in principle, available for benzophenone-mediated photoinduced energy transfer toward DNA.
authors.affiliation: Théorie-Modélisation-Simulation, Université de Lorraine - Nancy, SRSMC , Boulevard des Aiguillettes, 54000 Vandoeuvre-lès-Nancy, Nancy, France.|Théorie-Modélisation-Simulation, CNRS, SRSMC , Boulevard des Aiguillettes, Vandoeuvre-lès-Nancy, Nancy, France.
authors.forename: Marco
authors.initials: M
authors.lastname: Marazzi
authors.affiliation: Institute of Theoretical Chemistry, University of Vienna , Währinger Straße 17, A-1090 Vienna, Austria.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Mai
authors.affiliation: Instituto de Ciencia Molecular, Universitat de València , P.O. Box 22085, ES-46071 València, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Roca-Sanjuán
authors.forename: Mickaël G
authors.initials: MG
authors.lastname: Delcey
authors.forename: Roland
authors.initials: R
authors.lastname: Lindh
authors.affiliation: Institute of Theoretical Chemistry, University of Vienna , Währinger Straße 17, A-1090 Vienna, Austria.
authors.forename: Leticia
authors.initials: L
authors.lastname: González
authors.affiliation: Théorie-Modélisation-Simulation, Université de Lorraine - Nancy, SRSMC , Boulevard des Aiguillettes, 54000 Vandoeuvre-lès-Nancy, Nancy, France.|Théorie-Modélisation-Simulation, CNRS, SRSMC , Boulevard des Aiguillettes, Vandoeuvre-lès-Nancy, Nancy, France.
authors.forename: Antonio
authors.initials: A
authors.lastname: Monari
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