Henning et al. (1995) paper's page

Henning Th., Begemann B., Mutschke H., Dorschner J. (1995)
Optical properties of oxide dust grains.
Astron. Astrophys. Suppl. Ser., v. 112, pp. 143 - 161.

Optical constants: Some details:
Samples were prepared by quenching melts. All the preparational steps were perfomed under inert conditions to suppres the oxidation of ferrous (divalent) to ferric (trivalent) iron.
  The deternimation of the optical constants was made from measured reflectance at near normal incidence of the polished sample surfaces (0.2 - 500 micron) with following Lorentz oscillator fit (typically 5 oscilators) from ultraviolet to mid-infrared and Kramers-Kronig analysis in the region of the infrared vibrational bands.
  The oxides FexMg1-xO for x= 1.0, 0.9, 0.8, 0.7, 0.5, and 0.4 were considered in the paper.

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