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REFERENCES: |
    1) J. N. Zemel, J. D. Jensen, R. B. Schoolar.
    Electrical and optical properties of epitaxial films of PbS, PbSe, PbTe, and SnTe.
    <a href="https://doi.org/10.1103/PhysRev.140.A330"><i>Phys. Rev.</i> <b>140</b>, A330-A342, 1965</a><br>
    2) Handbook of Optics, 2nd edition, Vol. 2. McGraw-Hill 1994).<br>
    * Ref. 2 provides second term of the dispersion formula
COMMENTS: |
    300 K (27 °C)
DATA:
  - type: formula 1
    wavelength_range: 3.5 10
    coefficients: 0 15.9 0.77 133.2 141