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Low-temperatureand low atmospheric pressure infrared reflectance spectroscopy of Mars soil analog materials

Bishop, J. and Pieters, C.M.(1) (1995) Low-temperatureand low atmospheric pressure infrared reflectance spectroscopy of Mars soil analog materials. Journal of Geophysical Research, E3, pp. 5369-5379. American Geophysical Union, USA.

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Abstract

Infrared reflectance spectra of carefully selected Mars soil analog material have been measured under low atmospheric pressures and tempertures. Chemically altered montmorillonites containing ferrihydrite and hydrated ferric sulfate complexes are examinated, aswel as synthetic ferrihydrite and a palagonitic soil from Haleakala, Maui. Reflectance spectra of these analog materials exhibit subtle visible to near-infrared features, which are indicative of nanophase ferric oxides or oxyhydroxides and are similar to features observed in the spectra of the bright regions of Mars. Infrared reflectance spectra of these analgs include hydration features due to structural OH, bound H2O and adsorbed H2O. The spectral character of these hydration features is highly dependent on the sample environment and on the nature of the H2O/OH in the analogs. The behavior of the hydration featuresnear 1.9 muem, 2.2 muem, 2.7 muem, 3 muem, and 6 muem are reported in spectra measured under a Marslike atmospheric environment. In spectra of these analogs measured under dry Earth atmospheric conditions the 1.9-muem band depth is 8-17%; this band ismuch stronger under moist conditions. Under Marslike atmospheric conditions the 1.9-muem feature is broad and barely disverible (1-3% band depth) in spectra of the ferrihydrite and palagonitic soil samples. In comparale spectra of the ferric-sulfate-bearing montmorillonite the 1.9 muem feature is also broad, but stronger (6% band depth). In the low atmospheric pressureand temperature spectra of the ferrihydrite-bearing montmorillonite this feature is sharper than the other analogs and relatively stronger (6% band depth). Although the intensity of the 3-muemband is weaker in spectra of each of the analogs when measured under MArslike conditions, the 3- muem band remains a dominant feature and is especially broad in spectra of the ferrihydrite and palagonitic soil.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1995,
Title:Low-temperatureand low atmospheric pressure infrared reflectance spectroscopy of Mars soil analog materials
Authors:
AuthorsInstitution or Email of Authors
Bishop, J.UNSPECIFIED
Pieters, C.M.(1)UNSPECIFIED
Date:1995
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:E3
Page Range:pp. 5369-5379
Publisher:American Geophysical Union, USA
Series Name:100
Status:Published
Keywords:Mars, spectroscopy, low-temperature, analogs
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:UNSPECIFIED
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: elib DLR-Beauftragter
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 09:48

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