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REFERENCES: |
    H. H. Li.
    Refractive index of alkali halides and its wavelength and temperature derivatives.
    <a href="https://doi.org/10.1063/1.555536"><i>J. Phys. Chem. Ref. Data</i> <b>5</b>, 329-528 (1976)</a> and references therein.<br>
    * Sellmeier formula derivation is based on a single data point and knowledge of the dielectric constants and the characteristic absorption peaks.
COMMENTS: |
    297 K (24 °C).
DATA:
  - type: formula 1
    wavelength_range: 0.25 25
    coefficients: 2.55 0.25 0.171 7.23 70.42