Abstract
In this paper results of an experimental investigation of the spectra of submicrometersized silicon monoxide grains are presented. The grains manufactured from commercial SiO were prepared according to the Jena IR spectroscopy program for particulates of cosmic importance. The comparison of the laboratory spectra with those derived by means of Mie calculations using published refractive indices of bulk SiO revealed a fundamental discrepancy concerning the number and the positions of the bands. Therefore, the experimental SiO grains are suggested to change their internal structural state by the heating connected with the pressing of the KBr pellets, where the grains are embedded in. This sensitivity against heating by some hundred K rules out that SiO grains can be responsible for the 9.7 μm circumstellar as well as interstellar spectral feature.
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Gürtler, J., Schmidt, R., Dorschner, J. et al. Can silicon monoxide grains be responsible for the interstellar 9.7 micrometer absorption band?. Astrophys Space Sci 80, 249–255 (1981). https://doi.org/10.1007/BF00649151
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DOI: https://doi.org/10.1007/BF00649151