Journal Article

Laboratory far-infrared spectroscopy of terrestrial sulphides to support analysis of cosmic dust spectra

T. Brusentsova, R. E. Peale, D. Maukonen, P. Figueiredo, G. E. Harlow, D. S. Ebel, A. Nissinboim, K. Sherman and C. M. Lisse

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 3, pages 2569-2579
Published in print March 2012 | ISSN: 0035-8711
Published online February 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20228.x
Laboratory far-infrared spectroscopy of terrestrial sulphides to support analysis of cosmic dust spectra

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As an aid in interpreting data from space far-infrared (far-IR) missions, such as the Herschel Space Observatory with its Photodetector Array Camera and Spectrometer, this paper presents spectroscopic studies of selected naturally occurring terrestrial sulphide minerals in the wavelength range 15–250 μm. The data can also be used to support the return from other, both past and planned, IR space missions, such as the Infrared Space Observatory, Spitzer, SOFIA, SPiCA and Millimetron. In this study, we present far-IR spectra for 11 natural sulphide minerals in the form of dispersed powders of micron particle dimensions. Samples of various sulphides from the American Museum of Natural History mineral collection were selected based on criteria of diversity and potential astrophysical relevancy, based on their identification in Stardust, in stratospheric interplanetary dust particle samples, or in meteorites. Mineral species include digenite, galena, alabandite, sphalerite, wurtzite, covellite, pyrrhotite, pyrite, marcasite, chalcopyrite and stibnite. Most of the sulphides examined possess prominent and characteristic features in the far-IR range. Spectra obtained are compared to those available from previous studies. Far-IR peak frequencies and mass absorption coefficient values are tabulated. Effects of particle size distribution, low temperature, and provenance on IR spectra are demonstrated for selected samples.

Keywords: line: identification; methods: laboratory; techniques: spectroscopic; circumstellar matter; infrared: general; infrared: stars

Journal Article.  7724 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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