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Natural solid bitumens as possible analogs for cometary and asteroid organics: 1. Reflectance spectroscopy of pure bitumens

Moroz, L. and Arnold, G. and Korochantsev, A. and Wäsch, R. (1998) Natural solid bitumens as possible analogs for cometary and asteroid organics: 1. Reflectance spectroscopy of pure bitumens. Icarus, 134 (2), pp. 253-268.

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Abstract

Natural solid oil bitumens (asphaltites, kerites, anthraxolites) appear to be useful spectral analogs for cometary and asteroid refractory organics. They show similarities to the surfaces of dark asteroids and cometary nuclei, as well as compositional and structural resemblances to organic components of carbonaceous chondrites. These dark solids are composed of a variety of organic compounds, most of which are aromatic and aliphatic hydrocarbons. Spectral reflectance measurements in the range of 0.5 - 16 µm have been performed on a suite of solid bitumen powders. The samples were also characterized by chemical analyses, solid state 13C-NMR, and X-ray difractometry. The observed spectral variations between bitumen samples correlate with their chemical composition and structure. In the near-infrared region spectral parameters have been found, which make it possible to derive carbon aromaticities (f_a) and the most important elemental ratios /C/(C+H+N+S+O) or H/C). Moreover, these parameters can be used to estimate some structural characteristics of the aromatic component (an average interlayer spacing d_002 and vertical chrystallite size L_c). The use of the same spectral parameters may help to reveal the presence of mineral admixtures when their content in an organic-rich assemblage is too low to show any distinct absorption bands of the minerals.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2000,
Title:Natural solid bitumens as possible analogs for cometary and asteroid organics: 1. Reflectance spectroscopy of pure bitumens
Authors:
AuthorsInstitution or Email of Authors
Moroz, L.UNSPECIFIED
Arnold, G.UNSPECIFIED
Korochantsev, A.UNSPECIFIED
Wäsch, R.UNSPECIFIED
Date:1998
Journal or Publication Title:Icarus
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:134
Page Range:pp. 253-268
Status:Published
Keywords:reflectance spectroscopy, organic materials, asteroids, comets, composition
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Institut für Planetenerkundung
Deposited By: Susanne Pieth
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:04

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