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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ultrafast Dynamics in Na-Doped Water Clusters and the Solvated Electron
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Ultrafast Dynamics in Na-Doped Water Clusters and the Solvated Electron

机译：Na掺杂水团簇和溶剂化电子中的超快动力学

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摘要

The lifetimes of the first electronically excited state of (H2O)nNa and (D2O)n Na clusters up to n ) 40 have been measured by two-color pump-probe spectroscopy (800 and 400 nm) with 35 fs laser pulses. The excited-state lifetime decreases rapidly from 1.2 ps at n ) 2 to approximately 100 fs at n g 10. For (D2O)n Na, the average lifetime is about 3.6 times longer. The fast energy redistribution is explained by conversion of the electronic excitation into vibrations of the ground state. A simple model based on Fermi’s Golden Rule predicts the observed trends but fails to reproduce the observed lifetimes quantitatively. The longer lifetimes for deuterated clusters are discussed in the framework of the famous energy gap law and indicate that the stretching modes of water play an important role in the energy-transfer process
机译：（H2O）nNa和（D2O）n Na团簇直至n）40的第一电子激发态的寿命已通过使用35 fs激光脉冲的双色泵浦探针光谱法（800和400 nm）进行了测量。激发态寿命从n）2的1.2 ps迅速下降到n g 10的约100 fs。对于（D2O）n Na，平均寿命大约长3.6倍。通过将电子激励转换为基态振动来解释快速的能量重新分配。一个基于费米黄金定律的简单模型可以预测观察到的趋势，但无法定量地再现观察到的寿命。在著名的能隙定律的框架内讨论了氘代团簇的更长寿命，这表明水的拉伸模式在能量转移过程中起着重要作用。

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