Lead Selenide (From Palik I: pp. 520)
ANGSTROMS
NK
   2066.        0.64    0.86
   2254.        0.58    1.0
   2480.        0.54    1.2
   2755.        0.56    1.3
   3100.        0.64    1.9
   3542.        0.74    2.4
   4133.        1.25    3.20
   6199.        3.65    2.9
   8266.        4.64    2.64
  12400.        4.65    1.1