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

Optical Properties of Lithium Fluoride in the Infrared*

Milton Gottlieb
J. Opt. Soc. Am. 50(4) 343-349 (1960)

Diffuse Reflectance Measurements on Bulk Uranium Dioxide*

A. Companion and G. H. Winslow
J. Opt. Soc. Am. 50(11) 1043-1045 (1960)

Reflectance-Increasing Coatings for the Vacuum Ultraviolet and Their Applications*

P. H. Berning, G. Hass, and R. P. Madden
J. Opt. Soc. Am. 50(6) 586-597 (1960)

Infrared Band Assignments for the 2900 cm⁻¹ Region Methyl Group Vibrations in XC₆H₄COOCH₃, XC₆H₄CH₃, and XC₆H₄COCH₃ Molecules

Marie-Thèrèse Forel, Nelson Fuson, and Marie-Louise Josien
J. Opt. Soc. Am. 50(12) 1228-1231 (1960)

Precision Measurement of Absolute Specular Reflectance with Minimized Systematic Errors

H. E. Bennett and W. F. Koehler
J. Opt. Soc. Am. 50(1) 1-6 (1960)