The effect of particle size and porosity on spectral contrast in the mid-infrared |
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| Authors: | John W Salisbury John W Eastes |
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| Institution: | U.S. Geological Survey, National Center, M.S. 927, Reston, Virginia 22092, USA;U.S. Army Engineer Topographic Laboratories, Ft. Belvoir, Virginia 22060, USA |
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| Abstract: | Contrary to previous work, we find that the decreasing intensity of fundamental molecular vibration bands with decreasing particle size is due primarily to increasing porosity of the finer particle size ranges, rather than to particle size per se. This implies that laser reflectance measurements from orbiting spacecraft should avoid loss of spectral contrast for fine particulate surfaces, because such measurements near zero phase angle will benefit from the opposition effect. |
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