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OH Fragment from Benzoic Acid Monomer Photolysis: Threshold and Product State Distribution

2008; American Chemical Society; Volume: 112; Issue: 21 Linguagem: Inglês

10.1021/jp711806u

1520-5215

Qiang Wei, Julong Sun, Xian-Fang Yue, Shi‐Bo Cheng, Can‐Hua Zhou, Hongming Yin, Keli Han,

Molecular Junctions and Nanostructures

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.