On the Fresnel factor correction of sum-frequency generation spectra of interfacial water

被引:16
作者
Yu, Xiaoqing [1 ]
Chiang, Kuo-Yang [1 ]
Yu, Chun-Chieh [1 ]
Bonn, Mischa [1 ]
Nagata, Yuki [1 ]
机构
[1] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany
关键词
MOLECULAR-ORIENTATION; AIR/WATER INTERFACE; VAPOR INTERFACE; SURFACE; SPECTROSCOPY; DYNAMICS; TIME; CRYSTALLINE; CHEMISTRY;
D O I
10.1063/5.0133428
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Insights into the microscopic structure of aqueous interfaces are essential for understanding the chemical and physical processes on the water surface, including chemical synthesis, atmospheric chemistry, and events in biomolecular systems. These aqueous interfaces have been probed by heterodyne-detected sum-frequency generation (HD-SFG) spectroscopy. To obtain the molecular response from the measured HD-SFG spectra, one needs to correct the measured ssp spectra for local electromagnetic field effects at the interface due to a spatially varying dielectric function. This so-called Fresnel factor correction can change the inferred response substantially, and different ways of performing this correction lead to different conclusions about the interfacial water response. Here, we compare the simulated and experimental spectra at the air/water interface. We use three previously developed models to compare the experiment with theory: an advanced approach taking into account the detailed inhomogeneous interfacial dielectric profile and the Lorentz and slab models to approximate the interfacial dielectric function. Using the advanced model, we obtain an excellent quantitative agreement between theory and experiment, in both spectral shape and amplitude. Remarkably, we find that for the Fresnel factor correction of the ssp spectra, the Lorentz model for the interfacial dielectric function is equally accurate in the hydrogen (H)-bonded region of the response, while the slab model underestimates this response significantly. The Lorentz model, thus, provides a straightforward method to obtain the molecular response from the measured spectra of aqueous interfaces in the H-bonded region.
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页数:5
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