# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: |
    A. I. Golovashkin, I. E. Leksina, G. P. Motulevich and A. A. Shubin. The optical properties of niobium, <a href="http://jetp.ac.ru/cgi-bin/e/index/e/29/1/p27?a=list"><i>Sov. Phys. JETP</i> <b>29</b>, 27-34 (1969)</a>
COMMENTS: |
    4.2 K (-268.95 °C)
DATA:
  - type: tabulated nk
    data: |
        0.40 1.10 3.11
        0.41 1.33 2.94
        0.42 1.54 3.00
        0.43 1.66 3.01
        0.44 1.80 3.03
        0.45 1.87 3.08
        0.46 1.98 3.12
        0.48 2.08 3.00
        0.50 2.24 3.12
        0.52 2.28 3.14
        0.53 2.31 3.12
        0.54 2.35 3.12
        0.55 2.35 3.12
        0.56 2.32 3.09
        0.57 2.37 3.12
        0.58 2.38 3.13
        0.59 2.35 3.12
        0.60 2.30 3.07
        0.62 2.30 3.12
        0.64 2.31 3.10
        0.66 2.28 3.13
        0.68 2.26 3.14
        0.70 2.17 3.19
        0.72 2.14 3.25
        0.74 2.11 3.24
        0.76 2.02 3.40
        0.78 1.85 3.62
        0.80 1.69 3.69
        0.82 1.64 3.72
        0.84 1.60 3.78
        0.85 1.63 4.06
        0.86 1.51 4.05
        0.88 1.49 4.10
        0.90 1.47 4.19
        0.92 1.39 4.33
        0.94 1.31 4.40
        0.95 1.33 4.47
        0.98 1.24 4.67
        1.00 1.23 4.82
        1.05 1.10 5.15
        1.10 1.01 5.60
        1.15 0.97 6.15
        1.20 0.82 6.28
        1.30 0.78 7.03
        1.40 0.75 7.51
        1.45 0.62 8.00
        1.50 0.56 8.24
        1.55 0.45 8.52
        1.60 0.41 8.90
        1.70 0.41 9.92
        1.75 0.28 10.0
        1.80 0.28 10.4
        1.85 0.22 10.6
        1.90 0.23 11.0
        1.95 0.19 11.4
        2.00 0.18 11.8
        2.05 0.28 12.2
        2.10 0.40 12.6
        2.15 0.45 12.9
        2.20 0.63 13.2
        2.25 0.55 13.5
        2.30 0.48 14.1
        2.35 0.40 14.3
        2.40 0.34 14.4
        2.45 0.33 15.0
        2.50 0.30 15.3
        2.55 0.45 15.7
        2.60 0.83 16.1
        2.75 0.90 16.6
        3.00 1.10 17.3
        3.30 1.26 17.7
        3.50 1.53 18.5
        4.22 1.82 24.7
        4.70 2.04 28.4
        5.90 2.10 35.9
        6.70 3.40 38.4
        8.20 4.04 51.0
        9.20 4.99 58.8
CONDITIONS:
    temperature: 4.2