Computer Science
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976moon...15...15m&link_type=abstract
The Moon, vol. 15, Jan.-Feb. 1976, p. 15-30.
Computer Science
3
Glass, Lunar Soil, Photoabsorption, Spectral Reflectance, Absorption Spectra, Iron Oxides, Lunar Evolution, Lunar Maria, Phenomenology, Powder (Particles)
Scientific paper
The paper reports results of optical-absorption and diffuse-reflectance measurements in simulated lunar glasses of four compositions, both before and after mild oxidation and the subsequent growth of precipitated crystalline phases. The simulated glasses contained abundant microscopic and submicroscopic metallic iron, very little Fe(3+) as quenched, and Ti(3+). Optical absorption spectra are given for three glasses, and the principal features of these spectra are shown to be a broad intense band near 1.2 eV, a smaller band around 0.7 eV, and an 'absorption edge' rising into the UV. Reflectance spectra for powdered samples of two glasses are presented, and the principal qualitative features are described on the basis of the Kubelka-Munk approximation. It is concluded that the spectral characteristics of the oxidation darkening of synthetic glass powders and the maturation darkening of lunar soils can be understood in terms of the growth of a UV absorption edge and the development of opaque surface coatings on individual glass or soil particles.
Griscom D. L.
Marquardt C. L.
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