Effect of Solute Orientation on Solvation Dynamics at the Air/Water Interface
Effect of Solute Orientation on Solvation Dynamics at the Air/Water Interface
复制标题
溶质取向对空气/水界面溶剂化动力学的影响
DOI：
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复制
发表时间：
1999
期刊：
影响因子：
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通讯作者：
K. Eisenthal
中科院分区：
文献类型：
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作者：
D. Zimdars;K. Eisenthal
香豆素 314 (C314) 分子在空气/水界面的超快溶剂化动力学已被证明取决于它们相对于界面平面的方向。使用飞秒激光脉冲的泵浦/二次谐波探针方法用于测量界面溶剂化动力学。泵浦光是 S 偏振的，即在界面平面中，或 P 偏振的，即在垂直于界面平面的平面中。 S 泵浦的 C314 分子产生的溶剂化时间为 820 ± 60 fs，而 P 泵浦的溶剂化时间为 1215 ± 90 fs。溶剂化时间尺度上的界面不均匀展宽是由于 C314 在空气/水界面处的不同方向造成的。
The ultrafast solvation dynamics of courmarin 314 (C314) molecules at the air/water interface has been shown to depend on their orientation with respect to the plane of the interface. A pump/second harmonic probe method using femtosecond laser pulses were used to measure the interface solvation dynamics. The pump light was S polarized, i.e., in the interface plane, or P polarized, i.e., in the plane perpendicular to the plane of the interface. The S pumped C314 molecules yielded a solvation time of 820 ± 60 fs, whereas P pumped yielded a solvation time of 1215 ± 90 fs. The interface inhomogeneous broadening on the solvation time scale is due to the differing orientations of C314 at the air/water interface.