# this file is part of refractiveindex.info database
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REFERENCES: |
    H. Schröter.
    Über die Brechungsindizes einiger Schwermetallhalogenide im Sichtbaren und die Berechnung von Interpolationsformeln für den Dispersionsverlauf (On the refractive indices of some heavy-metal halides in the visible and calculation of interpolation formulas for dispersion).
    <a href="https://doi.org/10.1007/BF01391040"><i>Z. Phys.</i> <b>67</b>, 24-36 (1931)</a> [in German]
DATA:
  - type: formula 8
    wavelength_range: 0.495 0.67
    coefficients: 0.452505 0.09939 0.070537 -0.000150