title: Dynamics of acetone photodissociation: a surface hopping study.
abstract: We present on the fly surface hopping simulations of the dynamics of photoexcited acetone in the n → π* band, taking into account both the spin-orbit and the dynamic couplings and allowing for the C-C bond dissociation. The S0, S1, T1 and T2 states were considered and the propagation time was 50 ps. According to the simulation results, after excitation to S1 both Internal Conversion (IC) to S0 and InterSystem Crossing (ISC) to T1 or T2 take place at comparable rates; T2 plays an important role and the simultaneous treatment of the spin-orbit and dynamic couplings is shown to be mandatory to describe the photodynamics. We propose a mechanism that explains the observed fast and slow decay rates of the S1 state of acetone.
authors.affiliation: Dipartimento di Farmacia, Università di Pisa, via Bonanno Pisano 33, 56126 Pisa, Italy.
authors.forename: Lucilla
authors.initials: L
authors.lastname: Favero
authors.forename: Giovanni
authors.initials: G
authors.lastname: Granucci
authors.forename: Maurizio
authors.initials: M
authors.lastname: Persico
mesh_terms: D000096:Acetone / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D010782:Photolysis; D011789:Quantum Theory; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D000096:Acetone