title: Characterizing the rovibrational distribution of CD2CD2OH radicals produced via the photodissociation of 2-bromoethanol-d4.
abstract: This work characterizes the internal energy distribution of the CD(2)CD(2)OH radical formed via photodissociation of 2-bromoethanol-d(4). The CD(2)CD(2)OH radical is the first radical adduct in the addition of the hydroxyl radical to C(2)D(4) and the product branching of the OH + C(2)D(4) reaction is dependent on the total internal energy of this adduct and how that energy is partitioned between rotation and vibration. Using a combination of a velocity map imaging apparatus and a crossed laser-molecular beam scattering apparatus, we photodissociate the BrCD(2)CD(2)OH precursor at 193 nm and measure the velocity distributions of the Br atoms, resolving the Br((2)P(1/2)) and Br((2)P(3/2)) states with [2 + 1] resonance enhanced multiphoton ionization (REMPI) on the imaging apparatus. We also detect the velocity distribution of the subset of the nascent momentum-matched CD(2)CD(2)OH cofragments that are formed stable to subsequent dissociation. Invoking conservation of momentum and conservation of energy and a recently developed impulsive model, we determine the vibrational energy distribution of the nascent CD(2)CD(2)OH radicals from the measured velocity distributions.
authors: Department of Chemistry and the James Franck Institute, University of Chicago, Chicago Illinois 60637, USA.
authors: Caroline C
authors: CC
authors: Womack
authors: Ryan S
authors: RS
authors: Booth
authors: Matthew D
authors: MD
authors: Brynteson
authors: Laurie J
authors: LJ
authors: Butler
authors: David E
authors: DE
authors: Szpunar
mesh_terms: D000431:Ethanol / Q000031:analogs & derivatives* / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry*; D055668:Photochemical Processes; D012399:Rotation; D014732:Vibration
chemical_list: D017665:Hydroxyl Radical; D000431:Ethanol; C025475:ethylene bromohydrin