Ge (Palik ref 19) Aspnes (PhysRevB v27p985,1983) eV nk 6 1.022 2.774 5.94 1.073 2.801 5.90 1.108 2.831 5.84 1.167 2.862 5.8 1.209 2.873 5.74 1.273 2.874 5.70 1.293 2.863 5.64 1.345 2.852 5.60 1.360 2.846 5.54 1.372 2.842 5.50 1.380 2.842 5.44 1.387 2.849 5.40 1.383 2.854 5.34 1.377 2.877 5.30 1.371 2.897 5.24 1.366 2.938 5.20 1.364 2.973 5.14 1.366 3.031 5.10 1.370 3.073 5.04 1.382 3.146 5.00 1.394 3.197 4.94 1.417 3.282 4.90 1.435 3.342 4.84 1.470 3.439 4.80 1.498 3.509 4.74 1.546 3.624 4.70 1.586 3.709 4.64 1.659 3.852 4.60 1.720 3.960 4.54 1.839 4.147 4.50 1.953 4.297 4.44 2.226 4.543 4.40 2.516 4.669 4.34 3.038 4.653 4.30 3.338 4.507 4.24 3.633 4.207 4.20 3.745 4.009 4.14 3.837 3.756 4.10 3.869 3.614 4.04 3.896 3.436 4.00 3.905 3.336 3.94 3.916 3.209 3.90 3.920 3.137 3.84 3.930 3.043 3.80 3.936 2.986 3.74 3.949 2.909 3.70 3.958 2.863 3.64 3.974 2.799 3.60 3.985 2.759 3.54 4.005 2.702 3.50 4.020 2.667 3.44 4.048 2.615 3.40 4.070 2.579 3.34 4.106 2.517 3.30 4.128 2.469 3.24 4.150 2.392 3.20 4.157 2.340 3.14 4.153 2.262 3.10 4.141 2.215 3.04 4.107 2.164 3.00 4.082 2.145 2.94 4.052 2.135 2.90 4.037 2.140 2.84 4.030 2.162 2.80 4.035 2.181 2.74 4.058 2.215 2.70 4.082 2.240 2.64 4.133 2.281 2.60 4.180 2.309 2.54 4.267 2.353 2.50 4.340 2.384 2.44 4.482 2.429 2.40 4.610 2.455 2.34 4.883 2.434 2.30 5.062 2.318 2.24 5.198 2.125 2.20 5.283 2.049 2.14 5.554 1.924 2.1 5.748 1.634 2.04 5.708 1.150 2.00 5.588 0.933 1.9 5.294 0.638 1.84 5.152 0.537 1.80 5.067 0.500 1.74 4.961 0.430 1.70 4.897 0.401 1.64 4.816 0.364 1.60 4.763 0.345 1.50 4.653 0.298