Abstract

FT-IR transmission and reflection-absorption (RA) spectra were measured for Langmuir- Blodgett (LB) films of arachidic acid and the following conclusion could be reached from the measurements: (1) The structure of arachidic acid monolayer films deposited on CaF 2 plates changed with the surface pressure. (2) The structure of the monolayer films deposited on Au-evaporated glass slides did not show a marked dependency on the surface pressure, but the fraction of the trans configuration for the Ca-Cb-CequalsO group increased significantly with the pressure. (3) The carboxylic acid groups probably form a hydrogen bonding between the neighboring molecules in the monolayer films deposited on both CaF 2 plates and Au- evaporated glass slides. (4) Subcell packing of hydrocarbon chains in arachidic acid LB films on CaF 2 plates changes from hexagonal to orthorhombic upon going from the first monolayer to the second monolayer.

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