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Low-temperature single crystal reflection spectra of forsterite
Authors:H Suto  H Sogawa  S Tachibana  C Koike  H Karoji  A Tsuchiyama  H Chihara  K Mizutani  J Akedo  K Ogiso  T Fukui  S Ohara
Institution:National Astronomical Observatory Japan, Mitaka, Tokyo, Japan;Kyoto Pharmaceutical University, Yamashina, Kyoto, Japan;University of Tokyo, Department of Earth and Space Science, Hongo, Tokyo, Japan;Osaka University, Department of Earth and Space Science, Toyonaka, Osaka, Japan;Natioanl Institute of Information and Communication Technology, Koganei, Tokyo, Japan;National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaragi, Japan;Hosokawa Powder Technology Research Institute, Hirakata, Osaka, Japan;Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Myagi, Japan
Abstract:The infrared reflectivities of crystalline forsterite (Mg2SiO4) were measured for the temperature range 295–50 K for each crystal axis, between wavenumber 5000 and 100 cm?1. The reflection spectra show clear dependence of temperature; most of the bands become more intense, sharper and their peak positions shift to higher wavenumber with decreasing temperature. Reflection spectra were fitted with dispersion formula of damped oscillator model of the dielectric constants and the oscillator parameters in the model were derived. The absorption spectra of forsterite particle are calculated with the derived dielectric constants to show that the forsterite features are good thermal indicator for cold temperature range below 295 K.
Keywords:methods: laboratory  circumstellar matter  dust  extinction  ISM: lines and bands
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