Abstract
The first experimental investigation of the vibrational properties of Langmuir-Blodgett (behenic acid) thin films to use the new IR technique of spectroscopic phase-modulated ellipsometry (SPME) is presented. These measurements provide information about the orientation of molecular segments relative to the substrate surface. Evidence for the anisotropic orientation of 1–19 monolayers is presented. A structural transition is observed when the film thickness increases from 1 to more than 9 monolayers. The existence of two dimers per unit cell, as in the monoclinic C form, is identified on the IR spectra of thick films (more than 9 monolayers). The high sensitivity of SPME is emphasized. In particular, evidence for the anisotropic orientation of a single monolayer is presented. The influence of the substrate on the deposition mechanism of the first monolayer is also discussed. Because of its high sensitivity and its capability of recording data in situ, SPME appears to be a promising technique for studying organic thin film deposition processes.
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