title: Photodissociation dynamics of the phenyl radical via photofragment translational spectroscopy.
abstract: Photofragment translational spectroscopy was used to study the photodissociation dynamics of the phenyl radical C(6)H(5) at 248 and 193 nm. At 248 nm, the only dissociation products observed were from H atom loss, attributed primarily to H+o-C(6)H(4) (ortho-benzyne). The observed translational energy distribution was consistent with statistical decay on the ground state surface. At 193 nm, dissociation to H+C(6)H(4) and C(4)H(3)+C(2)H(2) was observed. The C(6)H(4) fragment can be either o-C(6)H(4) or l-C(6)H(4) resulting from decyclization of the phenyl ring. The C(4)H(3)+C(2)H(2) products dominate over the two H loss channels. Attempts to reproduce the observed branching ratio by assuming ground state dynamics were unsuccessful. However, these calculations assumed that the C(4)H(3) fragment was n-C(4)H(3), and better agreement would be expected if the lower energy i-C(4)H(3)+C(2)H(2) channel were included.
authors: Department of Chemistry, University of California, Berkeley, California 94720, USA.
authors: Bogdan
authors: B
authors: Negru
authors: Scott J
authors: SJ
authors: Goncher
authors: Amy L
authors: AL
authors: Brunsvold
authors: Gabriel M P
authors: GM
authors: Just
authors: Dayoung
authors: D
authors: Park
authors: Daniel M
authors: DM
authors: Neumark