Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..262s&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 262-264 (SEE N92-10728 01-91)
Physics
Geophysics
Absorption Spectra, Asteroids, Chondrites, Emission Spectra, Infrared Spectra, Meteoritic Composition, Analogs, Contamination, Hydrocarbons, Reflectance, Regolith, Remote Sensing, Spectra, Water Vapor
Scientific paper
Infrared biconical reflectance spectra of 60 powdered meteorite samples, representing 50 different stony meteorites, were measured as analogues of asteroidal regolith. Representative samples were measured in directional hemispherical reflectance to assure that Kirchhoff's Law can be used to predict relative emissivity from the reflectance spectra. These spectral data confirm that the O-H fundamental absorption band near 2.9 microns is an extremely sensitive indicator of incipient alteration, which often has taken place in powdered meteorite samples exposed only to water vapor in the air. Such non-carbonaceous samples typically contain less than 1 percent water by weight. Likewise, the C-H fundamental absorption bands near 3.4 and 3.5 microns are equally sensitive indicators of contamination with volatile hydrocarbons, which can also be absorbed from the air. The heavy, macromolecular hydrocarbons native to chondrites do not display such heavy bands, making detection of these bands in remote sensing of asteroids unlikely. Despite the spectral artifacts introduced by alteration and hydrocarbon contamination, powdered stony meteorites display a wide variety of real spectral features that can be used for their identification, including residual reststrahlen bands, absorption bands, and the Christiansen feature. Researchers found that the wavelengths of the peaks or troughs of each of these spectral features can be used independently to infer meteorite composition, but the best results are obtained when the entire spectral curve is used, or at least the portion of it encompassed by the 8 to 14 micron atmospheric window, in a digital search library.
Daria D. M.
Jarosewich Eugene
Salisbury John W.
No associations
LandOfFree
Infrared (2.08-14 micron) spectra of powered stony meteorites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Infrared (2.08-14 micron) spectra of powered stony meteorites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared (2.08-14 micron) spectra of powered stony meteorites will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1286499