Abstract
Cosmic dust analogue materials including an amorphous and a crystalline silicate, and ferrous oxide have been studied by reflectance spectroscopy of bulk surfaces as well as by transmission spectroscopy of particulates at temperatures down to 10 K. From the reflectance measurements optical data have been derived. The spectra of the crystalline materials (bronzite and FeO) show a sharpening and strengthening of the vibrational bands with decreasing temperature. The metal ion vibrations observed in the silicate glass of approximately cosmic composition in the far infrared have been found to be strongly temperature-dependent. The FIR continuum absorption caused by free charge carriers in the semiconducting FeO and by phonon difference processes in the crystalline silicate, respectively, showed the expected decrease with decreasing temperature.
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Mutschke, H., Henning, T. (1999). Infrared Spectroscopy of Cosmic Dust Analogues at Low Temperatures. In: Greenberg, J.M., Li, A. (eds) Formation and Evolution of Solids in Space. NATO ASI Series, vol 523. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4806-1_15
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DOI: https://doi.org/10.1007/978-94-011-4806-1_15
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