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  • 1
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    In:  CASI
    Publication Date: 2013-08-31
    Description: An analytical model is developed for the opposition effects (heiligenshein) in the case of light scattering from a semi-infinite, particulate medium with particles that are large relative to the wavelength. The effect is common for natural materials, and comprises a bright surge in light diffusively reflected from a surface at near zero phase. A generalized expression is devised for the extinction coefficient of a particulate medium. Models are developed for step function and hyperbolic tangent distributions of light scattered from a stratified medium and exhibiting the opposition effect. A maximum brightness amplitude increase of 0.753 is projected for the effect. Greater values must have other causes. To illustrate the theory it is fitted to observations of the Moon, an asteroid, and a satellite of Uranus; Europa is also discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 219
    Format: application/pdf
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  • 2
    Publication Date: 2013-08-31
    Description: The reflectance spectra of powdered samples of selected minerals, meteorites, lunar materials and frosts are presented as an aid in the interpretation of present and future remote sensing data of solar system objects. Spectra obtained in separate wavelength regions have been combined and normalized, yielding coverage from 92 to 1800 nm. Spectral features include reflectance maxima in the far UV region produced by valence-conduction interband transitions, and reflectance minima in the near UV, visible and near IR regions, produced by charge transfer and crystal field transitions. Specific maxima and minima are diagnostic of mineral type and composition; additionally, the minerals present in mixtures such as meteorites and lunar samples can be determined.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 205
    Format: application/pdf
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