Chromium optical constants, D. W. Lynch and W. R. Hunter, Palik vol. II
nm
nk
248.0   0.85    2.01
253.0   0.86    2.07
258.3   0.86    2.13
263.8   0.86    2.21
269.5   0.88    2.28
275.5   0.89    2.35
281.8   0.90    2.42
287.0   0.91    2.49
293.8   0.94    2.58
300.2   0.98    2.67
307.7   1.02    2.76
316.3   1.06    2.85
323.7   1.12    2.95
333.3   1.18    3.04
341.6   1.26    3.12
351.2   1.33    3.18
362.5   1.39    3.24
372.3   1.43    3.31
385.0   1.44    3.40
396.1   1.48    3.54
409.2   1.54    3.71
424.6   1.65    3.89
438.1   1.80    4.06
455.8   1.99    4.22
471.4   2.22    4.36
490.1   2.49    4.44
512.3   2.75    4.46
532.1   2.98    4.45
558.5   3.18    4.41
582.1   3.34    4.38
610.8   3.48    4.36
700.5   3.84    4.37
815.7   4.23    4.34
826.6   4.27    4.33
849.2   4.31    4.32
861.0   4.33    4.32
885.6   4.38    4.31
911.6   4.42    4.30
939.3   4.47    4.29
968.6   4.49    4.28
999.9   4.50    4.28
1033   4.52    4.29
1069   4.53    4.30
1107   4.53    4.31
1148   4.53    4.34
1192   4.51    4.36
1240   4.47    4.43
1292   4.47    4.50
1348   4.45    4.56
1378   4.43    4.60
1442   4.35    4.66
1512   4.24    4.81
1590   4.13    5.03
1675   4.06    5.30
1771   4.01    5.59