Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011eas....52..245j&link_type=abstract
EAS Publications Series, Volume 52, 2011, pp.245-250
Astronomy and Astrophysics
Astrophysics
Scientific paper
Infrared spectroscopy is the best astronomical tool for studying the composition of cosmic dust. Thanks to the Herschel satellite, dust properties from the FIR to mm wavelength range will be sampled in different astrophysical environments. In the laboratory, the study of the temperature and structural dependence of FIR absorption of cosmic dust analogs including agglomeration is essential to interpret observational spectra. For crystalline materials, FIR single phonon bands are temperature dependent due to the anharmonicity of the vibrational potentials. This strong temperature dependence of the FIR bands' positions can be used as a thermometer of the dust temperature. In amorphous material, the FIR absorption is dominated by disorder-induced single phonon processes and in the submillimeter and millimeter range by highly temperature-dependent low energy processes, e.g. tunneling transitions in two-level systems. The effect of these processes on the FIR absorptivity in amorphous silicates will be demonstrated.
Henning Th
Jäger Cornelia
Mutschke Harald
No associations
LandOfFree
Laboratory Astrophysics of Dust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Laboratory Astrophysics of Dust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laboratory Astrophysics of Dust will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-737592