SELF-QUENCHING OF 1-NAPHTHOL - CONNECTION BETWEEN TIME-RESOLVED AND STEADY-STATE MEASUREMENTS
SELF-QUENCHING OF 1-NAPHTHOL - CONNECTION BETWEEN TIME-RESOLVED AND STEADY-STATE MEASUREMENTS
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DOI：
10.1016/0301-0104(94)00098-0
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发表时间：
1994-06-01
期刊：
影响因子：
2.3
通讯作者：
FLEMING, GR
中科院分区：
文献类型：
--
作者：
PINES, E;FLEMING, GR
用单光子计数仪研究了1-萘酚在水溶液中电子激发后的光化学反应。发现在质子解离后，受激发的萘酚酸阴离子随时间呈t-1/2依赖性非指数衰减。我们把这归因于萘酚阴离子与它的双生质子的自猝灭反应。接触淬火速率为3.5 × 10(10) s-1。我们还发现，一些质子在D2O中以8 × 10(9) s-1的双相重组速率绝热相互作用。在质子清除剂存在的情况下，对萘酚盐离子对的时间依赖性逃逸概率进行了采样。我们证明了最终清除概率的前导项是由孤立对在其产生后相对长时间内的齐次清除率的时间积分给出的。
The photochemistry of 1-naphthol following its electronic excitation in aqueous solution was investigated by a single-photon counting apparatus. It was found that following the proton dissociation the excited naphtholate anion decays non-exponentially With a t-1/2 dependence over time. This we attribute to a self-quenching reaction of the naphtholate anion by its geminate proton. The quenching rate on contact is 3.5 X 10(10) s-1. We also found that some of the protons interact adiabatically with a geminate recombination rate in D2O of 8 X 10(9) s-1. The time-dependent escape probability of the naphtholate ion-pair was sampled by carrying out the experiment in presence of a proton scavenger. We show that the leading term in the ultimate scavenging probability is given by the time integral of the homogeneous scavenging rate of the isolated pair at relatively long times following its creation.