Infrared spectroscopy of interplanetary dust in the laboratory |
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| Authors: | P Fraundorf RI Patel JJ Freeman |
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| Institution: | McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130USA;Corporate Research and Development Staff, Monsanto Company, St. Louis, Missouri 63166USA |
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| Abstract: | Diagnostic infrared spectra of individual nanogram-sized interplanetary dust particles (IDPs) collected in the Earth's stratosphere have been obtained. A mount containing three crushed “chondritic” IDPs shows features near 1000 and 500 cm?1, suggestive of crystalline pyroxene, and different from those of crystalline olivine, amorphous olivine, or meteoritic clay minerals. The structural diversity of chondritic IDPs and possible effects of atmospheric heating must be considered when comparing this spectrum with astrophysical spectra of interplanetary and cometary dust. Transmission electron microscope (TEM) and infrared observations are also reported on one member of the rare subset of IDPs which resemble hydrated carbonaceous chondrite matrix material. The infrared spectrum of this particle between 4000 and 400 cm?1 closely matches that of the C2 meteorite Murchison. TEM observations suggest that this class of particles might serve as a thermometer for the process of heating on atmospheric entry. |
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