Infrared data of sulphides of interstellar dust importance

Details Infrared data of sulphides of interstellar dust importance Infrared data of sulphides of interstellar dust importance

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994inpht..35..361m&link_type=abstract

Infrared Physics & Technology, Volume 35, Issue 2-3, p. 361-374.

Physics

8

Scientific paper

In the last decade the existence of a prominent 30 μm emission feature in the IR spectra of carbon-rich sources has been confirmed. It was tentatively identified with the characteristic lattice vibration band of magnesium sulphide. Meanwhile, the observational material has considerably increased, but optical data of relevant sulphide materials are not available. In this paper optical data of Mg-Fe sulphides have been determined to provide the base for a thorough proof of the identification proposal and for theoretical modelling of the source spectra.
Samples of the system FexMg1-xS(x = 0.1... 1) have been prepared in the laboratory. Subsequently, the materials have been characterized structurally by X-ray diffraction, scanning electron microscopy and energy dispersive micro-probe analysis.
These samples have been studied IR-spectroscopically by measuring the reflectance of polished surfaces and the transmittance of small particles embedded in polyethylene pellets. From the reflectance spectra optical data in the wavenumber range 1000-20 cm-1 have been derived. Extinction coefficients of small spheres and a continuous distribution of ellipsoids in polyethylene calculated from these data have been compared with the measured transmission spectra.
The emission of small Fe-Mg sulfide particles has been calculated and compared with an observed spectrum.

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