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题名: Novel method for accurate determination of the orientational angle of interfacial chemical groups
作者: Lu, R;  Gan, W;  Wang, HF
关键词: sum frequency generation vibrational spectra ;  null angle ;  orientation angle ;  methyl ;  methanol ;  orientation parameter
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2003-10-01
DOI: 10.1360/03wb0071
卷: 48, 期:20, 页:2183-2187
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: The common practice for determination of orientational angle of interfacial molecular groups with the interfacial sum frequency generation vibrational spectroscopy (SFG-VS) is to measure the intensity ratio between two SFG intensities at a certain vibrational frequency with different polarization directions. Because sometimes the SFG at one polarization direction is too weak to be measure accurately, this ratio usually has big uncertainty, and consequently it is impossible to obtain accurate orientation parameters. Thus the corresponding orientation angle was not accurately calculated. Through analyzing the basic relationship between the orientation angle and SFG intensity, we found that the null angle method would be suitable for such cases. The null. angle measurement is simple, precise and easy to realize, therefore can greatly improve the accuracy of orientation angle. Using this method, we determined the orientation angle of the methyl group of methanol orients about 31.8 +/- 2.4degrees from the surface normal at the air/methanol interface, much more accurate than the previously reported value of <42&DEG;. The null angle method provides a reliable experimental analytical tool for studying the orientation of the chemical group or chemical bond at interfaces.
关键词[WOS]: SUM-FREQUENCY GENERATION ;  OPTICAL 2ND-HARMONIC GENERATION ;  SURFACE NONLINEAR OPTICS ;  2ND HARMONIC-GENERATION ;  LIQUID-VAPOR INTERFACE ;  VIBRATIONAL SPECTROSCOPY ;  MOLECULAR-ORIENTATION ;  PHASE-TRANSITIONS ;  WATER-INTERFACE ;  METHANOL
语种: 英语
WOS记录号: WOS:000186305600007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138274
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, State Key Lab Mol React Dynam, Ctr Mol Sci, Inst Chem, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Lu, R,Gan, W,Wang, HF. Novel method for accurate determination of the orientational angle of interfacial chemical groups[J]. CHINESE SCIENCE BULLETIN,2003,48(20):2183-2187.
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