Abstract

Reflectivity measurements were performed on films of Li6F and Li7F. The films were deposited onto substrates of natural lithium fluoride crystals by vacuum evaporation. Typical film thickness was 10 μ. Because the lattice constants of the pure isotope material and the natural crystal differ by less than 0.03%, the crystallinity of the films was good. It was found that the fundamental optical mode frequency is proportional to the square root of the reduced mass, as predicted from the simple model of an ionic crystal.

© 1960 Optical Society of America

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