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arXiv 1611.06243physics.chem-ph
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O-H基团的分子间和分子内耦合决定水/空气界面的振动响应

Both Inter- and Intramolecular Coupling of O-H Groups Determine the Vibrational Response of the Water/Air Interface

Jan Schaefer, Ellen H. G. Backus, Yuki Nagata, Mischa Bonn

摘要:

振动耦合不仅与化学反应后多余能量的耗散有关,而且与阐明分子结构和动力学有关。这是特别重要的OH伸缩振动光谱的水,它是已知的,在散装内和分子间的耦合改变强度和线形的光谱。与本体相比,在水-空气界面处的OH基团的分子间/分子内耦合的统一图片一直缺乏。在这里,结合和频产生实验和模拟同位素稀释的水和醇,我们揭示了分子间和分子内耦合对界面水的振动光谱的影响。我们的研究结果表明,分子间和分子内耦合有助于OH伸缩振动响应的净H2O表面,与分子内耦合产生的双峰功能,而分子间耦合诱导一个显着的红移的OH伸缩响应。

英文摘要:

Vibrational coupling is relevant not only for dissipation of excess energy after chemical reactions but also for elucidating molecular structure and dynamics. It is particularly important for OH stretch vibrational spectra of water, for which it is known that in bulk both intra- and intermolecular coupling alter the intensity and line shape of the spectra. In contrast with bulk, the unified picture of the inter/intra-molecular coupling of OH groups at the water-air interface has been lacking. Here, combining sum-frequency generation experiments and simulation for isotopically diluted water and alcohols, we unveil effects of inter- and intramolecular coupling on the vibrational spectra of interfacial water. Our results show that both inter- and intramolecular coupling contribute to the OH stretch vibrational response of the neat H2O surface, with intramolecular coupling generating a double-peak feature, while the intermolecular coupling induces a significant red shift in the OH stretch response.

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