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REFERENCES: |
    C. R. Mansfield and E. R. Peck.
    Dispersion of helium.
    <a href="https://doi.org/10.1364/JOSA.59.000199"><i>J. Opt. Soc. Am.</i> <b>59</b>, 199-203 (1969)</a>
COMMENTS: |
    Standard conditions: 0 °C, 760 torr (101.325 kPa).
DATA:
  - type: formula 6
    wavelength_range: 0.4801 2.0586
    coefficients: 0 0.01470091 423.98
CONDITIONS:
    temperature: 273.15
    pressure: 101325