Grain size dependence of far-infrared extinction spectra of amorphous fine grains |
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Authors: | Chiyoe Koike Hiroichi Hasegawa Takeshi Hattori |
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Affiliation: | (1) Kyoto Pharmaceutical University, Yamashina, Kyoto, Japan;(2) Department of Physics, Faculty of Science, Kyoto University, Kyoto, Japan;(3) Department of Applied Physics, Faculty of Engineering, Osaka University, Suita, Japan |
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Abstract: | The far-infrared extinction spectra of fused silica grains with the size range from 1.8 m to 60 Å were measured. The spectra depend clearly on the grain size. For large grain sizes (from 1.8 m to 400 Å) the spectra show almost the –2 dependence ( is the wavelength), which resembles that of the bulk material. For fine grains (70 and 60 Å) the spectra are less steep, the wavelength dependence being –1. This grain size dependence of extinction spectra agrees essentially with the prediction of Seki and Yamamoto. |
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