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题名: Increased interfacial thickness of the NaF, NaCl and NaBr salt aqueous solutions probed with non-resonant surface second harmonic generation (SHG)
作者: Bian, Hong-tao1, 2;  Feng, Ran-ran1, 2;  Xu, Yan-yan1, 2;  Guo, Yuan1;  Wang, Hong-fei1
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2008
DOI: 10.1039/b806362a
卷: 10, 期:32, 页:4920-4931
收录类别: SCI
文章类型: Review
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Specific ion effects on the nonlinear optical response from the water molecules at the air/sodium halide solution interfaces are measured using non-resonant surface second harmonic generation (SHG). Procedures have been developed to monitor and remove the impurities in the salt solution samples to ensure measurement of small changes in the SHG signal. Quantitative polarization analysis of the measured SHG data indicated that the average orientation of the interfacial water molecules changed only slightly around 40 degrees with the increase of the bulk concentration of the three sodium halides, namely NaF, NaCl and NaBr, from that of the neat air/water interface. The observed significant SHG signal increase with the bulk salt concentration is attributed to the overall increase of the thickness of the interfacial water molecular layer, following the order of NaBr > NaCl approximate to NaF. The absence of the electric-field-induced SHG (EFISHG) effect indicated that the electric double layer at the salt aqueous solution interface is much weaker than that predicted from the molecular dynamics (MD) simulations. These results provided quantitative data to the specific anion effects on the interfacial water molecules of the electrolyte aqueous solution, not only for the larger and more polarizable Br(-) anion, but also for the smaller and less polarizable F(-) and Cl(-) anions.
关键词[WOS]: SUM-FREQUENCY GENERATION ;  LIQUID-VAPOR INTERFACE ;  MOLECULAR-DYNAMICS SIMULATIONS ;  ORIENTATION-INSENSITIVE METHODOLOGY ;  QUADRATIC OPTICAL-RESPONSE ;  2ND HARMONIC-GENERATION ;  AIR-WATER-INTERFACE ;  VIBRATIONAL SPECTROSCOPY ;  AIR/WATER INTERFACE ;  PHOTOELECTRON-SPECTROSCOPY
语种: 英语
WOS记录号: WOS:000258271800029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140896
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100864, Peoples R China

Recommended Citation:
Bian, Hong-tao,Feng, Ran-ran,Xu, Yan-yan,et al. Increased interfacial thickness of the NaF, NaCl and NaBr salt aqueous solutions probed with non-resonant surface second harmonic generation (SHG)[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2008,10(32):4920-4931.
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