title: Visible/Infrared Dissociation of NO3: Roaming in the Dark or Roaming on the Ground?
abstract: We present a DC slice imaging study of roaming dynamics in the photodissociation of the nitrate radical, NO3, contrasting pure visible excitation with a combination of visible and CO2 laser excitation at 10.6 μm. Images of specific rotational levels of NO are seen to reflect dissociation on the ground and first excited electronic states, as reported in previous work. The branching is obtained for specific rotational levels by comparison to quasiclassical trajectory calculations of the dynamics on these two surfaces. The results for the visible dissociation are found to be very similar to the combination of visible and infrared, raising questions about the nature of the coupling of these surfaces, the extent to which roaming takes place on both, and how the final product branching is determined.
authors.affiliation: †Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States.
authors.forename: Ravin
authors.initials: R
authors.lastname: Fernando
authors.affiliation: †Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States.
authors.forename: Arghya
authors.initials: A
authors.lastname: Dey
authors.affiliation: †Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States.
authors.forename: Bernadette M
authors.initials: BM
authors.lastname: Broderick
authors.affiliation: ‡State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
authors.forename: Bina
authors.initials: B
authors.lastname: Fu
authors.affiliation: §Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, 201 Dowman Drive, Atlanta, Georgia 30322, United States.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Homayoon
authors.affiliation: §Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, 201 Dowman Drive, Atlanta, Georgia 30322, United States.
authors.forename: Joel M
authors.initials: JM
authors.lastname: Bowman
authors.affiliation: †Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States.
authors.forename: Arthur G
authors.initials: AG
authors.lastname: Suits