1997A&A...328..419K

Spectra are presented of SiS₂ samples in a variety of crystal forms taken at both room temperature and at 600 K over the wavelength range from 5-25 microns. All spectra show strong features at 22.5 and 9.5 microns as well as less intense bands at 7.5, 8.5, and 12.5 microns. All room temperature spectra also show a feature at 10.7 microns that disappears on heating. One form of SiS₂ shows strong correlated absorption features at 20 and 17 microns that are rapidly quenched by exposure to humid air with no significant change to the 7-13 and 22 micron features also present in the sample. These SiS₂ spectra are consistent with previous spectra obtained by Nuth et al. (1985ApJ...290L..41N), are marginally consistent with the identification of SiS₂ as the source of the observed 21 micron peak in several carbon-rich stellar sources, and suggest additional observations of these stellar sources that might confirm or refute the presence of SiS₂. Specifically, if no feature at 17 microns is detected in objects that display the strong 21 micron emission feature then SiS₂ should be ruled out as a candidate for this band.