Derivation of mid-infrared (5-25 microns) optical constraints of some silicates and palagonite

Details Derivation of mid-infrared (5-25 microns) optical constraints of some silicates and palagonite Derivation of mid-infrared (5-25 microns) optical constraints of some silicates and palagonite

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..563r&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 563-564 (SEE N92-10728 01-91)

Physics

Geophysics

Aerosols, Infrared Spectra, Mars Atmosphere, Mars Surface, Mineralogy, Minerals, Refraction, Silicates, Spectral Reflectance, Clays, High Frequencies, Oscillators, Permittivity

Scientific paper

This study was initially conceived in order to aid in the interpretation of Martian surface and atmospheric aerosol mineralogy. As a result, the minerals included are biased toward samples which represent hydrated and hydroxylated silicates. Due to their physical particle size, clays and other materials, such as palagonite, cannot be prepared using typical preparation techniques. Yet in some cases, such as for Mars, these are the materials of perhaps the greatest interest. In order to obtain a suitable sample of these less cohesive materials for the laboratory measurements, a KBr pellet die was used and a pellet of the pure sample was prepared. For all clays and the palagonite, a pellet with highly reflective surfaces at visible wavelengths was produced. The reflectivities of all samples were determined, and to derive the optical constants of a materials as a function of wavelength, dispersion analysis was used which describes the real and imaginary indices of refraction as the contributions due to a sum of classical oscillators and relates them via Frensel's equations for non-normal incidence, the the measured near-normal reflectivity. The final values that were determined represent averages of several model fits to each data set using the same number of oscillators by varying the high frequency dielectric constant.

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