TABLE X (Continued) Silicon Dioxide (Glass) eV cm-1 pm n k kABS 0.06075 490 20.41 0.5777 1.28 0.05951 480 20.83 0.7517 1.86 0.05889 475 21.05 1.002 2.22 0.05827 470 21.28 1.484 2.39 0.05703 460 21.74 2.308 2.29 0.05455 440 22.73 2.936 1.29 0.05107 420 23.81 2.912 0.738 0.04959 400 25.00 2.739 0.397 0.04649 375 26.67 2.537 0.199 0.20 0.04339 350 28.57 2.388 0.13 0.04030 325 30.77 2.284 9.2 x 10-2 0.03720 300 33.33 2.210 6.7 0.03410 275 36.36 2.147 5.6 0.03100 250 40.00 2.100 4.6 0.01240 100 100.0 1.967 [1] 1.59 x 10-2 [1] 0.009919 80 125.0 1.962 1.19 X 10-2 0.007439 60 166.7 1.959 8.62 x 10-' 0.004959 40 250.0 1.957 6.96 0.002480 20 500.0 1.955 7.96 References are indicated in brackets. Data marked kABS were obtained from transmission measurements.