IR Spectroscopy and X-Ray Diffraction of Disordered Olivine

Details IR Spectroscopy and X-Ray Diffraction of Disordered Olivine IR Spectroscopy and X-Ray Diffraction of Disordered Olivine

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0826l&link_type=abstract

American Astronomical Society, DPS meeting #28, #08.26; Bulletin of the American Astronomical Society, Vol. 28, p.1088

Astronomy and Astrophysics

Astronomy

Scientific paper

We report preliminary results from laboratory experiments aimed at understanding the IR spectra of disordered silicates, such as those thought to be present in comet and interstellar dust. Using a ball mill, we have produced samples of olivine varying between perfectly crystalline and nearly amorphous. The degree of disorder is determined from x-ray diffraction. The samples IR transmission spectra are then measured using an FTIR between 2 and 25 microns. Particular attention is paid to the 9.7 um silicate feature. We are able to correlate the width and contrast of the silicate feature with a known amount of molecular disorder. The technique has the advantage of being able to reproducibly generate an arbitrary degree of disorder and to quantitatively relate it to IR spectral characteristics.

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