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THE RESPONSE OF SELECTED ROCK SPECIMENS TO VACUUM ULTRAVIOLET LIGHT.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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This is a report on an investigation of the reflectance of selected igneous rocks irradiated by light in the spectral range from 550 to 1800 A. The effect of ultraviolet light upon atoms and molecules is discussed, and Maxwells equations are used in a classical analysis of the optical properties of solids. This analysis shows that the optical properties are functions of the light wave frequency. A one-meter vacuum ultraviolet scanning monochrometer with a capillary discharge type light source was used in irradiating the rock specimens. Commercial helium was used as the source gas. Experimental analysis of the reflectance properties was approached by calculating the intensity ratio of the 584 A line to the 1216 A line and the 1167 A line to the 1304 A line for the reflected light recordings of each rock type. These reflected intensity ratios were then compared to the corresponding intensity ratios for the incident light spectrum. It was found that almost all of the rocks examined tend to exhibit higher reflectivity at shorter wavelengths. Furthermore, it appears that each rock type has a characteristic response related to the chemical composition. Author
APPROVED FOR PUBLIC RELEASE