Origin of the diffuse interstellar absorption bands. II - Evidence for MgO and CaO solids in the interstellar medium

Details Origin of the diffuse interstellar absorption bands. II - Evidence for MgO and CaO solids in the interstellar medium Origin of the diffuse interstellar absorption bands. II - Evidence for MgO and CaO solids in the interstellar medium

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..45..253d&link_type=abstract

Astrophysics and Space Science, vol. 45, Dec. 1976, p. 253-259. Research supported by the National Research Council of Canada.

Astronomy and Astrophysics

Astrophysics

34

Absorption Spectra, Calcium Oxides, Interstellar Extinction, Interstellar Matter, Magnesium Oxides, Optical Reflection, Solids, Spectral Reflectance, Ultraviolet Radiation

Scientific paper

Surface excitons in very small (~ 10-20 A) particles of MgO and CaO and
other oxides are shown to absorb at the wavelength of the 2175 A
extinction bump. Required column densities of these oxides are
compatible with cosmic elemental abundances if it is assumed that the
Mie scattering theory is invalid for these quantum particles

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