title: A slice imaging and multisurface wave packet study of the photodissociation of CH3I at 304 nm.
abstract: The role of the conical intersection between the (1)Q(1) and (3)Q(0) excited states in the photodissociation of CH(3)I at 304 nm is investigated drawing a comparison between the adiabatic--through direct absorption to the (3)Q(1) state--and non-adiabatic--via the (1)Q(1)→(3)Q(0) conical intersection--production of I atoms in the ground (2)P(3/2) state. The versatility of the slice imaging technique in combination with resonance enhanced multiphoton ionization (REMPI) detection of I((2)P(3/2)) atoms allow distinct measurements of the competing processes. The I((2)P(3/2)) atom kinetic energy distributions (KEDs) obtained in both cases reflect inverted vibrational progressions of the ν(2) umbrella mode of the CH(3) co-product. The experimental results show a satisfactory agreement with multisurface wave packet calculations using a reduced dimensionality (pseudotriatomic) model carried out on the available ab initio potential energy surfaces.
authors.affiliation: Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Rubio-Lago
authors.forename: J D
authors.initials: JD
authors.lastname: Rodríguez
authors.forename: A
authors.initials: A
authors.lastname: García-Vela
authors.forename: M G
authors.initials: MG
authors.lastname: González
authors.forename: G A
authors.initials: GA
authors.lastname: Amaral
authors.forename: L
authors.initials: L
authors.lastname: Bañares