Abstract

Sharp absorption lines have been observed at temperatures near 4°K in samples of fused silica and crystal quartz. The strongest lines are near 3365 cm⁻¹ and 3472 cm⁻¹ and have widths at half height of less than 2.5 cm⁻¹. With increasing temperature the absorption lines are shifted to higher frequencies; in addition, the lines are broadened and the peak absorption is decreased.

© 1957 Optical Society of America

Absorption, Fluorescence, and Magnetic Properties of Gadolinium Chloride (GdCl₃·6H₂O)†

G. H. Dieke and L. Leopold
J. Opt. Soc. Am. 47(10) 944-954 (1957)

Ratio-Recording System for the Johns Hopkins 100-Foot Absorption Cell*

C. Harvey Palmer
J. Opt. Soc. Am. 47(5) 367-377 (1957)

Fluorescent Lifetimes of Uranyl Salts at Different Temperatures*

L. A. Hall and G. H. Dieke
J. Opt. Soc. Am. 47(12) 1092-1096 (1957)

Secondary and Tertiary Interferometric Wavelength Standards in the 1.5–2.5 μ Region*

D. H. Rank, A. H. Guenther, J. N. Shearer, and T. A. Wiggins
J. Opt. Soc. Am. 47(2) 144-148 (1957)

Spectral Emissivity of Hydrogen Chloride from 1000–3400 cm⁻¹*

V. Robert Stull and Gilbert N. Plass
J. Opt. Soc. Am. 50(12) 1279-1285 (1960)