It has been generally accepted that there are significant quadrupolar and bulk contributions to the second-harmonic generation (SHG) reflected from the neat air/water interface, as well as common liquid interfaces. Because there has been no general methodology to determine the quadrupolar and bulk contributions to the SHG signal from a liquid interface, this conclusion was reached based on the following two experimental phenomena: the breaking of the macroscopic Kleinman symmetry and the significant temperature dependence of the SHG signal from the neat air/water interface. However, because the sum frequency generation vibrational spectroscopy (SFG-VS) measurement of the neat air/water interface observed no apparent temperature dependence, the temperature dependence in the SHG measurement has been reexamined and proven to be an experimental artifact. Here we present a complete microscopic analysis of the susceptibility tensors of the air/water interface, and show that dipolar contribution alone can be used to address the issue of the breaking of the macroscopic Kleinman symmetry at the neat air/water interface. Using this analysis, the orientation of the water molecules at the interface can be obtained, and it is consistent with the measurement from SFG-VS. Therefore, the key rationales to conclude significantly quadrupolar and bulk contributions to the SHG signal of the neat air/water interface can no longer be considered as valid as before. This new understanding of the air/water interface can shed light on our understanding of the nonlinear optical responses from other molecular interfaces as well.
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8 December 2005
Research Article|
December 14 2005
Reconsideration of second-harmonic generation from isotropic liquid interface: Broken Kleinman symmetry of neat air/water interface from dipolar contribution
Wen-kai Zhang;
Wen-kai Zhang
a)
State Key Laboratory of Molecular Reaction Dynamics,
Institute of Chemistry
, The Chinese Academy of Sciences, Beijing 100080, China
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De-sheng Zheng;
De-sheng Zheng
a)
State Key Laboratory of Molecular Reaction Dynamics,
Institute of Chemistry
, The Chinese Academy of Sciences, Beijing 100080, China
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Yan-yan Xu;
Yan-yan Xu
a)
State Key Laboratory of Molecular Reaction Dynamics,
Institute of Chemistry
, The Chinese Academy of Sciences, Beijing 100080, China
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Hong-tao Bian;
Hong-tao Bian
a)
State Key Laboratory of Molecular Reaction Dynamics,
Institute of Chemistry
, The Chinese Academy of Sciences, Beijing 100080, China
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Yuan Guo;
Yuan Guo
State Key Laboratory of Molecular Reaction Dynamics,
Institute of Chemistry
, The Chinese Academy of Sciences, Beijing 100080, China
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Hong-fei Wang
Hong-fei Wang
b)
State Key Laboratory of Molecular Reaction Dynamics,
Institute of Chemistry
, The Chinese Academy of Sciences, Beijing 100080, China
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J. Chem. Phys. 123, 224713 (2005)
Article history
Received:
August 22 2005
Accepted:
October 18 2005
Citation
Wen-kai Zhang, De-sheng Zheng, Yan-yan Xu, Hong-tao Bian, Yuan Guo, Hong-fei Wang; Reconsideration of second-harmonic generation from isotropic liquid interface: Broken Kleinman symmetry of neat air/water interface from dipolar contribution. J. Chem. Phys. 8 December 2005; 123 (22): 224713. https://doi.org/10.1063/1.2136875
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