Actions for Optical constants of kerogen from 0. 15 to 40. mu. m [electronic resource] : Comparison with meteoritic organics

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Optical constants of kerogen from 0. 15 to 40. mu. m [electronic resource] : Comparison with meteoritic organics

Published
Washington, D.C : United States. Dept. of Energy. Office of Energy Research, 1989.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (17 pages) : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy. Office of Energy Research, United States. National Aeronautics and Space Administration, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Kerogens are dark, complex organic materials produced on the earth primarily by geologic processing of biologic materials, but kerogens have chemical and spectral similarities to some classes of highly processed extraterrestrial organic materials. Kerogen-like solids have been proposed as constituents of the very dark reddish surfaces of some asteroids and are also spectrally similar to some carbonaceous organic residues and the Iapetus dark material. Kerogen can thus serve as a useful laboratory analogue to very dark, spectrally red extraterrestrial materials; its optical constants can be used to investigate the effects of particle size, void space and mixing of bright and dark components in models of scattering by dark asteroidal, cometary, and satellite surfaces. We report measurements of the optical constants of both Type II kerogen and of macromolecular organic residue from the Murchison carbonaceous chondrite via transmission and reflection measurements on thin films. These films, of thickness 0.2--1.3 μm, are produced by vacuum deposition of kerogen powder heated to 550--750°C onto sapphire, CaF₂, and CsI substrates. IR spectra of the thin films show that the spectral features of the kerogen powder are retained. Apparently no substantial change in optical constants occurs upon vacuum deposition, except for the desirable loss of silicate contaminants which can be seen in the spectra of the powder.
Report Numbers
E 1.99:conf-8910341-2
conf-8910341-2
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1989.
"conf-8910341-2"
"DE91004535"
1. international conference on laboratory research for planetary atmospheres, Bowie, MD (USA), 25 Oct 1989.
Thompson, W.R.; Arakawa, E.T.; Sagan, C. . Lab. for Planetary Studies; Khare, B.N.; Gilmour, I.; Meisse, C.
Funding Information
AC05-84OR21400
View MARC record | catkey: 13827616