Accession Number : AD0764121

Title :   Optical Constants for Terrestrial Analogs of Lunar Materials.

Descriptive Note : Research memorandum,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s) : Egan,Walter G. ; Hilgeman,Theodore

Report Date : JUL 1973

Pagination or Media Count : 34

Abstract : Representative terrestrial analogs of the dominant lunar constituents plagioclase feldspar and pyroxene were selected, and the refractive, absorption and scattering components were determined separately in the range from 0.33 to 2.3 micrometers. A newly developed theory was employed to separate the absorption from the scattering based on thin section total reflectance and transmission measurements. The selected minerals were bytownite (Minnesota) and augit (Ontario, Canada); a comparison of their absorption peaks with those inferred from reflectance measurements on lunar samples reveal comparable bands at 2.0, 1.3, 1.0 to 0.9, 0.6 micrometer and the UV. The similarities indicate that the optical constants reasonably characterize the lunar surface material. Another result is the introduction of plagioclase as a possible candidate material causing the 0.6 micrometer feature in asteroids and in the interstellar medium. (Modified author abstract)

Descriptors :   (*ROCK FORMING MINERALS, OPTICAL PROPERTIES), FELDSPAR, SILICATES, REFRACTION, REFLECTION, LIGHT TRANSMISSION, PETROGRAPHY

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE