Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..227n&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 227-228 (SEE N92-10728 01-91)
Physics
Geophysics
Breccia, Emission Spectra, Igneous Rocks, Infrared Spectra, Lunar Geology, Lunar Rocks, Lunar Soil, Lunar Surface, Moon, Reflectance, Spectral Reflectance, Drying, Infrared Spectrometers, Spectrometers, Telescopes
Scientific paper
Presented here are infrared reflectance spectra of a typical set of Apollo samples to illustrate spectral character in the mid-infrared (4 to 12 microns) of lunar materials and how the spectra varies among three main forms: soil, breccia, and igneous rocks. Reflectance data, to a close approximation, are the inverse of emission spectra; thus, for a given material the spectral reflectance (R) at any given wavelength is related to emission (E) by 1 - R equals E. Therefore, one can use reflectance spectra of lunar samples to predict how emission spectra of material on the lunar surface will appear to spectrometers on orbiting spacecraft or earthbound telescopes. Spectra were measured in the lab in dry air using a Fourier Transform Infrared spectrometer. Shown here is only the key portion (4 to 12 microns) of each spectrum relating to the principal spectral emission region for sunlit lunar materials and to where the most diagnostic spectral features occur.
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