Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4816m&link_type=abstract
American Astronomical Society, DPS meeting #42, #48.16
Astronomy and Astrophysics
Astronomy
Scientific paper
To aid in interpreting data from Herschel Space Observatory's Photodetector Array Camera and Spectrometer (PACS), we spectrally characterized 146 species of minerals from the American Museum of Natural History's mineral, rock, and meteorite collections in the 15 to 250 micron wavelength range. Chemical and crystallographic identity of all samples were confirmed by means of electron microprobe and x-ray multi-grain micro-diffraction. Species investigated included nesosilicate olivines, silicas, pyroxenes, feldspars, carbonates, phyllosilicates, oxides, and sulfides. Samples were ground to micron dimensions, with micron size distributions ensured by Stokes precipitation and confirmed by scanning electron microscopy. Milligram quantities were then dispersed in polyethylene powder and melted into pellets. Spectra were collected using a Fourier spectrometer with globar source, pellicle beamsplitters, and a 4 K bolometer. Temperature dependence of the spectra down to 15 K revealed sharpening and blue-shifts of the characteristic absorption lines, and in some cases the resolution of additional spectral features occurred at low temperatures. Generally, the spectra are highly characteristic of chemical composition and crystal structure. We suggest the use of these results for mineral identification in the far-infrared emission spectra of interplanetary dust, dust in protoplanetary disks, and comet dust tails. All spectra will be posted in public data bases. Funding was provided by NASA-JPL.
Boesenberg J.
Brusentsova T. N.
Ebel Denton S.
Figueiredo P.
Harlow George E.
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