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Influence of Crystal Surface on the Optical Transmission of Lithium Fluoride in the Vacuum-Ultraviolet Spectrum

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Abstract

A selective decrease in the spectral transmittance of cleaved LiF crystals at wavelengths shorter than 1600 Å has been observed when they are exposed to the atmosphere. The decrease is attributed to a surface layer produced on the crystals by reaction with moisture. It can be substantially inhibited by immediate post-cleavage storage in dry gas or in vacuum. Optical-quality thin plates of currently available, commercial hard-to-cleave LiF that is softer than LiF previously manufactured can be obtained by first hardening the crystal with x rays, cleaving the plates, and then thermally annealing out the optical effects of the x rays.

© 1963 Optical Society of America

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