REFLECTANCE INFRARED SPECTROSCOPIC ANALYSIS OF MONOLAYER FILMS AT THE AIR-WATER-INTERFACE

被引:46
作者
REN, Y
MEUSE, CW
HSU, SL
STIDHAM, HD
机构
[1] UNIV MASSACHUSETTS,DEPT POLYMER SCI & ENGN,AMHERST,MA 01003
[2] UNIV MASSACHUSETTS,MAT RES LAB,AMHERST,MA 01003
[3] UNIV MASSACHUSETTS,DEPT CHEM,AMHERST,MA 01003
关键词
D O I
10.1021/j100085a025
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 transition moment direction and absorbance are reported for the CH2 stretching vibrations of H(CH2) (18)-OH (I) at 2918 and 2850 cm(-1) and for the CF2 stretching vibrations of F(CF2)(10)-(CH2)(2)-OH (II) at 1151 and 1207 cm(-1) in densely packed monolayers at an air/water interface. Packing was monitored by measuring force-area relations for the two systems. Absorbance and transition moment direction parameters are given as estimated by fitting observed s-polarized reflectance spectra obtained as a function of incidence angle to calculated theoretical reflectance spectra by minimum least-squares difference. The parameters determined from s-polarized reflectance spectra were used to calculate p-polarized reflectance spectra. The results compared well with experimental observations of p-polarized reflectance spectra. The results suggest that, at the packing densities used, the chain axis orientations are 12.9 degrees and 0 degrees for I and II, respectively.
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页码:8424 / 8430
页数:7
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