Abstract
KNACKE1 has pointed out that quartz particles possess strong absorption bands at λ∼10µ. Although these features occur in the spectral region 3–10µ, where Johnson2 has found humps in interstellar extinction curves, by itself this cannot be taken as indicating a silica component in the interstellar grains. It has already been pointed out3 that impurities in any solid with a Debye frequency close to that of graphite would give optically active lattice bands at λ∼10µ*. Further evidence would be necessary before quartz could be considered as a serious alternative to interstellar graphite grains.
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References
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KRISHNA SWAMY, K., WICKRAMASINGHE, N. Interstellar Extinction by Quartz Grains. Nature 217, 1236–1237 (1968). https://doi.org/10.1038/2171236a0
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DOI: https://doi.org/10.1038/2171236a0
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