Abstract

A theoretical investigation has been made of the difference in absorbance between that calculated from the Lambert law and that from thin-layer optics which fully takes into account the effect of multiple reflections on a symmetrical five-layer film such as black soap film. The absorbance of a black soap film can be very different from that of a thick film because of interference effects. The error involved may be as large as 25%. In addition, for both three-layer and symmetrical five-layer films, general approximate equations are presented for the absorbance by a stratified medium due to the presence of an absorbing layer. These equations are appropriate for film thickness on the order of 50 nm for incident radiation at 3400 cm -1 and are accurate to less than 2.5% error.

Deviation from Lambert’s Law and Polarization of Light Emitted by Incandescent Tungsten, Tantalum and Molybdenum and Changes in the Optical Constants of Tungsten with Temperature*

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Light Scattering from Ultrathin Free Liquid Films: Variation of the Optical Functions with Geometry and Film Thickness*

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