Direct versus indirect H atom elimination from photoexcited phenol molecules
Direct versus indirect H atom elimination from photoexcited phenol molecules
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DOI：
10.1021/jp802155b
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发表时间：
2008-10-02
影响因子：
2.9
通讯作者：
Stavros, Vasilios G.
中科院分区：
文献类型：
--
作者：
Iqbal, Azhar;Pegg, Lara-Jane;Stavros, Vasilios G.
在紫外光吸收之后，光学暗pi sigma*态的活跃作用已被涉及到许多生物分子的光化学中。这项工作集中在200 nm激发下的pi sigma*态在苯酚的光化学中的作用。通过对紫外光激发后的中性氢的探测，我们发现沿着解离的piσ势能面的氢消除发生在10330fs内，这表明在S(1)/S(2)和S(0)/S(2)的锥形交叉处有有效的耦合，在我们的测量时间范围内没有发现振动激发(SO)苯酚的统计单分子衰变的作用。
The active role of the optically dark pi sigma* state, following UV absorption, has been implicated in the photochemistry of a number of biomolecules. This work focuses on the role of the pi sigma* state in the photochemistry of phenol upon excitation at 200 nm. By probing the neutral hydrogen following UV excitation, we show that hydrogen elimination along the dissociative pi sigma* potential energy surface occurs within 103 30 fs, indicating efficient coupling at the S(1)/S(2) and S(0)/S(2) conical intersections, with no identifiable role of statistical unimolecular decay of vibronically excited (SO) phenol in the timeframe of our measurements.