VIBRATIONAL SUM-FREQUENCY SPECTROSCOPY OF AN ADSORBED MONOLAYER OF HEXADECANOL ON WATER - DESTRUCTIVE INTERFERENCE OF ADJACENT LINES

被引：68

作者：

WOLFRUM, K

LAUBEREAU, A

机构：

[1] Physik-Department E11, Technische Universität, München

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 228卷 / 1-3期

关键词：

D O I：

10.1016/0009-2614(94)00892-2

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：

The vibrational spectrum of the long chain fatty alcohol hexadecanol adsorbed at a water/air interface is studied by sum-frequency (SF) spectroscopy, observing three vibrations of the terminal methyl group. A theoretical analysis is presented that predicts opposite phases of adjacent vibrational modes leading to destructive interference in the SF spectrum. This novel interference effect is reported with enhanced spectral resolution and signal-to-noise ratio. Application of this effect for the determination of the line amplitudes of the degenerate stretching mode yields more precise information on molecular orientation. The tilt angle of the molecular chain with respect to the surface normal in a spontaneously formed monolayer has been determined to be 8.2 degrees+/-1.8 degrees.

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页码：83 / 88

页数：6

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