DIRECT FEMTOSECOND MEASUREMENTS OF SINGLE COLLISION DOMINATED GEMINATE RECOMBINATION TIMES OF SMALL MOLECULES IN LIQUIDS
DIRECT FEMTOSECOND MEASUREMENTS OF SINGLE COLLISION DOMINATED GEMINATE RECOMBINATION TIMES OF SMALL MOLECULES IN LIQUIDS
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DOI：
10.1016/0009-2614(93)85300-d
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发表时间：
1993-03-05
影响因子：
2.8
通讯作者：
HARRIS, CB
中科院分区：
文献类型：
--
作者：
SCHWARTZ, BJ;KING, JC;HARRIS, CB
我们报告了二碘甲烷 (CH2I2) 光解的 CH2I2 光产物的飞秒瞬态吸收光谱。结果表明，在几种不同的溶剂中，该光碎片在几乎等于 350 fs 的时间尺度内消失。这意味着在这些简单的液体中，二碘甲烷正在经历成对重组。重组产率而非重组率显示出与溶剂相关。与其他小分子的光解离动力学的比较表明，成对重组的动力学主要由一大类分子中与周围溶剂笼的单次碰撞主导，并且该过程可能是普遍的。
We report the femtosecond transient absorption spectra of the CH2I2 photoproduct of the methylene iodide (CH2I2) photodissociation. The results indicate a disappearance of this photofragment on a almost-equal-to 350 fs time scale in several different solvents. The implication is that in these simple liquids, methylene iodide is undergoing geminate recombination. Recombination yields, but not rates are shown to be solvent dependent. Comparison to the photodissociation dynamics of other small molecules suggests that the kinetics of geminate recombination are dominated by a single collision with the surrounding solvent cage in a large class of molecules and that the process may be universal.