title: OH fragment from benzoic acid monomer photolysis: threshold and product state distribution.
abstract: Photodissociation dynamics of benzoic acid monomer (BAM) at different ultraviolet excitation wavelengths (280-295 nm) has been investigated. The nascent OH product state distributions were measured using the laser-induced fluorescence (LIF) technique. The rotational state distributions, the Lambda-doublet-state ratio, and spin-orbit state distributions of the OH fragment were also measured at 280-294 nm. The OH fragments are vibrationally cold, and their rotational state distributions are peaked at J'' = 3.5 at each photolysis wavelength. No LIF signal of OH fragments was observed at 295 nm. The photodissociation threshold is determined to be 102.5-103.9 kcal/mol for OH channel. The dissociative state and mechanism have been discussed for OH produced from the photodissociation of BAM.
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wei
authors.forename: Ju-Long
authors.initials: JL
authors.lastname: Sun
authors.forename: Xian-Fang
authors.initials: XF
authors.lastname: Yue
authors.forename: Shi-Bo
authors.initials: SB
authors.lastname: Cheng
authors.forename: Can-Hua
authors.initials: CH
authors.lastname: Zhou
authors.forename: Hong-Ming
authors.initials: HM
authors.lastname: Yin
authors.forename: Ke-Li
authors.initials: KL
authors.lastname: Han