The Structure of Evaporated Metal Films and Their Optical Properties

Abstract
The structure of evaporated films of eight different metals in thicknesses from 30 to 500A has been observed in the electron microscope and correlated with their optical properties. The stable form of films thinner than a characteristic thickness was found to be aggregated. For each film the absorptions for wave-lengths in the visible were determined from the measured transmissions and reflections. The rate of formation is shown to affect the structure and the optical properties, slow rates in general giving more aggregated structure and increased light absorption.

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