Picosecond time resolved Raman scattering study of hydrogen abstraction by triplet excited benzoquinone
Picosecond time resolved Raman scattering study of hydrogen abstraction by triplet excited benzoquinone
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三重激发苯醌夺氢的皮秒时间分辨拉曼散射研究
DOI：
10.1021/ja00276a006
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发表时间：
1986
影响因子：
15
通讯作者：
L. Brus
中科院分区：
文献类型：
--
作者：
R. Rossetti;L. Brus
在近似上研究了三联体对苯醌在H/亚2/O：醇混合溶剂中的激发态光物理和H原子抽离反应。= 20ps时间尺度，时间分辨共振拉曼光谱。该三重态在20ps内存在，其拉曼光谱完全发育。看起来在这个时候振动松弛是完全的。在现有条件下，在振动弛豫过程中不存在H原子的抽离。从较长时间尺度上的松弛三重态提取，在氘化溶剂中具有明确的动力学同位素。结果还表明，在高光通量下，自发拉曼泵浦和探针实验可以对低浓度的化学瞬态进行研究。
The excited state photophysics and H atom abstraction reaction of triplet p-benzoquinone in mixed H/sub 2/O:alcohol solvents are investigated on the approx. = 20 ps time scale with time-resolved resonance Raman spectroscopy. The triplet is present within 20 ps, and its Raman spectrum is fully developed. It appears that vibrational relaxation is complete at this time. There is no H atom abstraction during the vibrational relaxation process under present conditions. Abstraction proceeds from the relaxed triplet on longer time scales, with a clear kinetic isotope in deuterated solvents. The results also demonstrate that spontaneous Raman pump and probe experiments, at high optical flux, can be performed on chemical transients in low concentration.