# this file is part of refractiveindex.info database
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REFERENCES: "R. Althoff and J. H. Hertz. Measurement of the optical constants of Na and K in the range of wavelength from 2.5 to 10 μ, <a href=\"https://doi.org/10.1016/0020-0891(67)90025-5\"><i>Infrared Phys.</i> <b>7</b>, 11-16 (1967)</a>"
DATA:
  - type: tabulated nk
    data: |
        2.5 0.346 7.55
        3.2 0.648 9.65
        4.5 1.38 14.3
        5.5 1.66 17.1
        7.2 2.89 21.6
        10.15 4.77 28.2
