# 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. D. Rakić, A. B. Djurišic, J. M. Elazar, M. L. Majewski.
    Optical properties of metallic films for vertical-cavity optoelectronic devices.
    <a href="https://doi.org/10.1364/AO.37.005271"><i>Appl. Opt.</i> <b>37</b>, 5271-5283 (1998)</a><br>
    [<a href="https://github.com/polyanskiy/refractiveindex.info-scripts/blob/main/scripts/Rakic%201998%20-%20Be%20(BB%20model).py">Calculation script (Python)</a>]
COMMENTS: |
    Fit of experimental data from several sources to Brendel-Bormann (BB) model
DATA:
  - type: tabulated nk
    data: |
        2.4797e-01 1.6444e+00 2.9702e+00
        2.5494e-01 1.7278e+00 3.0024e+00
        2.6212e-01 1.8112e+00 3.0308e+00
        2.6949e-01 1.8942e+00 3.0554e+00
        2.7707e-01 1.9763e+00 3.0766e+00
        2.8487e-01 2.0573e+00 3.0944e+00
        2.9288e-01 2.1368e+00 3.1091e+00
        3.0112e-01 2.2147e+00 3.1210e+00
        3.0960e-01 2.2907e+00 3.1302e+00
        3.1831e-01 2.3646e+00 3.1372e+00
        3.2726e-01 2.4362e+00 3.1420e+00
        3.3647e-01 2.5055e+00 3.1450e+00
        3.4594e-01 2.5723e+00 3.1464e+00
        3.5567e-01 2.6366e+00 3.1466e+00
        3.6568e-01 2.6983e+00 3.1456e+00
        3.7596e-01 2.7574e+00 3.1439e+00
        3.8654e-01 2.8139e+00 3.1415e+00
        3.9742e-01 2.8678e+00 3.1388e+00
        4.0860e-01 2.9190e+00 3.1358e+00
        4.2009e-01 2.9677e+00 3.1328e+00
        4.3191e-01 3.0138e+00 3.1300e+00
        4.4406e-01 3.0574e+00 3.1275e+00
        4.5656e-01 3.0984e+00 3.1255e+00
        4.6940e-01 3.1370e+00 3.1241e+00
        4.8261e-01 3.1731e+00 3.1235e+00
        4.9619e-01 3.2068e+00 3.1238e+00
        5.1015e-01 3.2381e+00 3.1250e+00
        5.2450e-01 3.2670e+00 3.1275e+00
        5.3926e-01 3.2937e+00 3.1312e+00
        5.5443e-01 3.3180e+00 3.1362e+00
        5.7003e-01 3.3400e+00 3.1427e+00
        5.8606e-01 3.3597e+00 3.1508e+00
        6.0255e-01 3.3772e+00 3.1606e+00
        6.1950e-01 3.3924e+00 3.1723e+00
        6.3693e-01 3.4054e+00 3.1858e+00
        6.5485e-01 3.4161e+00 3.2013e+00
        6.7328e-01 3.4246e+00 3.2191e+00
        6.9222e-01 3.4308e+00 3.2390e+00
        7.1170e-01 3.4348e+00 3.2614e+00
        7.3172e-01 3.4366e+00 3.2863e+00
        7.5231e-01 3.4360e+00 3.3139e+00
        7.7347e-01 3.4332e+00 3.3443e+00
        7.9523e-01 3.4282e+00 3.3777e+00
        8.1761e-01 3.4209e+00 3.4142e+00
        8.4061e-01 3.4113e+00 3.4540e+00
        8.6426e-01 3.3994e+00 3.4973e+00
        8.8857e-01 3.3853e+00 3.5442e+00
        9.1357e-01 3.3690e+00 3.5951e+00
        9.3928e-01 3.3505e+00 3.6499e+00
        9.6570e-01 3.3298e+00 3.7091e+00
        9.9287e-01 3.3070e+00 3.7728e+00
        1.0208e+00 3.2822e+00 3.8412e+00
        1.0495e+00 3.2554e+00 3.9145e+00
        1.0791e+00 3.2268e+00 3.9931e+00
        1.1094e+00 3.1964e+00 4.0770e+00
        1.1406e+00 3.1644e+00 4.1666e+00
        1.1727e+00 3.1309e+00 4.2620e+00
        1.2057e+00 3.0961e+00 4.3635e+00
        1.2396e+00 3.0602e+00 4.4712e+00
        1.2745e+00 3.0233e+00 4.5854e+00
        1.3104e+00 2.9856e+00 4.7062e+00
        1.3472e+00 2.9474e+00 4.8338e+00
        1.3851e+00 2.9089e+00 4.9683e+00
        1.4241e+00 2.8702e+00 5.1099e+00
        1.4642e+00 2.8316e+00 5.2586e+00
        1.5054e+00 2.7933e+00 5.4145e+00
        1.5477e+00 2.7555e+00 5.5777e+00
        1.5913e+00 2.7183e+00 5.7482e+00
        1.6360e+00 2.6820e+00 5.9262e+00
        1.6821e+00 2.6466e+00 6.1116e+00
        1.7294e+00 2.6125e+00 6.3045e+00
        1.7780e+00 2.5796e+00 6.5049e+00
        1.8281e+00 2.5481e+00 6.7128e+00
        1.8795e+00 2.5180e+00 6.9283e+00
        1.9324e+00 2.4896e+00 7.1515e+00
        1.9867e+00 2.4629e+00 7.3823e+00
        2.0426e+00 2.4379e+00 7.6208e+00
        2.1001e+00 2.4147e+00 7.8671e+00
        2.1592e+00 2.3934e+00 8.1213e+00
        2.2199e+00 2.3740e+00 8.3835e+00
        2.2824e+00 2.3565e+00 8.6537e+00
        2.3466e+00 2.3410e+00 8.9320e+00
        2.4126e+00 2.3276e+00 9.2186e+00
        2.4805e+00 2.3163e+00 9.5136e+00
        2.5503e+00 2.3070e+00 9.8172e+00
        2.6221e+00 2.3000e+00 1.0129e+01
        2.6958e+00 2.2951e+00 1.0451e+01
        2.7717e+00 2.2924e+00 1.0781e+01
        2.8497e+00 2.2921e+00 1.1120e+01
        2.9298e+00 2.2940e+00 1.1469e+01
        3.0123e+00 2.2984e+00 1.1827e+01
        3.0970e+00 2.3052e+00 1.2195e+01
        3.1841e+00 2.3145e+00 1.2573e+01
        3.2737e+00 2.3264e+00 1.2962e+01
        3.3658e+00 2.3409e+00 1.3361e+01
        3.4605e+00 2.3582e+00 1.3770e+01
        3.5579e+00 2.3783e+00 1.4191e+01
        3.6580e+00 2.4013e+00 1.4623e+01
        3.7609e+00 2.4273e+00 1.5067e+01
        3.8667e+00 2.4564e+00 1.5522e+01
        3.9755e+00 2.4888e+00 1.5990e+01
        4.0873e+00 2.5246e+00 1.6470e+01
        4.2023e+00 2.5638e+00 1.6963e+01
        4.3206e+00 2.6068e+00 1.7468e+01
        4.4421e+00 2.6535e+00 1.7988e+01
        4.5671e+00 2.7041e+00 1.8521e+01
        4.6956e+00 2.7589e+00 1.9068e+01
        4.8277e+00 2.8181e+00 1.9629e+01
        4.9635e+00 2.8817e+00 2.0205e+01
        5.1032e+00 2.9501e+00 2.0796e+01
        5.2468e+00 3.0234e+00 2.1403e+01
        5.3944e+00 3.1019e+00 2.2026e+01
        5.5461e+00 3.1858e+00 2.2665e+01
        5.7022e+00 3.2754e+00 2.3320e+01
        5.8626e+00 3.3710e+00 2.3992e+01
        6.0275e+00 3.4728e+00 2.4682e+01
        6.1971e+00 3.5811e+00 2.5390e+01
        6.3715e+00 3.6963e+00 2.6116e+01
        6.5507e+00 3.8187e+00 2.6860e+01
        6.7350e+00 3.9487e+00 2.7624e+01
        6.9245e+00 4.0866e+00 2.8406e+01
        7.1193e+00 4.2328e+00 2.9209e+01
        7.3196e+00 4.3877e+00 3.0032e+01
        7.5256e+00 4.5517e+00 3.0876e+01
        7.7373e+00 4.7254e+00 3.1740e+01
        7.9550e+00 4.9091e+00 3.2627e+01
        8.1788e+00 5.1034e+00 3.3535e+01
        8.4089e+00 5.3087e+00 3.4465e+01
        8.6455e+00 5.5256e+00 3.5418e+01
        8.8887e+00 5.7546e+00 3.6395e+01
        9.1388e+00 5.9964e+00 3.7394e+01
        9.3959e+00 6.2515e+00 3.8418e+01
        9.6603e+00 6.5205e+00 3.9466e+01
        9.9321e+00 6.8041e+00 4.0539e+01
        1.0212e+01 7.1029e+00 4.1636e+01
        1.0499e+01 7.4177e+00 4.2759e+01
        1.0794e+01 7.7492e+00 4.3908e+01
        1.1098e+01 8.0980e+00 4.5083e+01
        1.1410e+01 8.4651e+00 4.6283e+01
        1.1731e+01 8.8510e+00 4.7511e+01
        1.2061e+01 9.2568e+00 4.8765e+01
        1.2401e+01 9.6831e+00 5.0046e+01
        1.2749e+01 1.0131e+01 5.1355e+01
        1.3108e+01 1.0601e+01 5.2690e+01
        1.3477e+01 1.1094e+01 5.4053e+01
        1.3856e+01 1.1611e+01 5.5444e+01
        1.4246e+01 1.2154e+01 5.6862e+01
        1.4647e+01 1.2722e+01 5.8308e+01
        1.5059e+01 1.3317e+01 5.9782e+01
        1.5482e+01 1.3940e+01 6.1283e+01
        1.5918e+01 1.4592e+01 6.2812e+01
        1.6366e+01 1.5274e+01 6.4368e+01
        1.6826e+01 1.5986e+01 6.5952e+01
        1.7300e+01 1.6730e+01 6.7562e+01
        1.7786e+01 1.7506e+01 6.9199e+01
        1.8287e+01 1.8316e+01 7.0863e+01
        1.8801e+01 1.9161e+01 7.2552e+01
        1.9330e+01 2.0041e+01 7.4267e+01
        1.9874e+01 2.0957e+01 7.6007e+01
        2.0433e+01 2.1910e+01 7.7772e+01
        2.1008e+01 2.2902e+01 7.9561e+01
        2.1599e+01 2.3932e+01 8.1373e+01
        2.2207e+01 2.5001e+01 8.3208e+01
        2.2832e+01 2.6111e+01 8.5066e+01
        2.3474e+01 2.7261e+01 8.6944e+01
        2.4134e+01 2.8454e+01 8.8844e+01
        2.4813e+01 2.9688e+01 9.0763e+01
        2.5512e+01 3.0965e+01 9.2701e+01
        2.6229e+01 3.2284e+01 9.4658e+01
        2.6967e+01 3.3648e+01 9.6631e+01
        2.7726e+01 3.5054e+01 9.8622e+01
        2.8506e+01 3.6505e+01 1.0063e+02
        2.9308e+01 3.8000e+01 1.0265e+02
        3.0133e+01 3.9540e+01 1.0468e+02
        3.0980e+01 4.1123e+01 1.0673e+02
        3.1852e+01 4.2751e+01 1.0879e+02
        3.2748e+01 4.4423e+01 1.1086e+02
        3.3670e+01 4.6139e+01 1.1294e+02
        3.4617e+01 4.7899e+01 1.1503e+02
        3.5591e+01 4.9702e+01 1.1713e+02
        3.6592e+01 5.1548e+01 1.1924e+02
        3.7622e+01 5.3437e+01 1.2136e+02
        3.8680e+01 5.5369e+01 1.2348e+02
        3.9768e+01 5.7342e+01 1.2561e+02
        4.0887e+01 5.9356e+01 1.2775e+02
        4.2038e+01 6.1411e+01 1.2989e+02
        4.3220e+01 6.3506e+01 1.3204e+02
        4.4436e+01 6.5641e+01 1.3419e+02
        4.5686e+01 6.7814e+01 1.3635e+02
        4.6972e+01 7.0025e+01 1.3851e+02
        4.8293e+01 7.2273e+01 1.4068e+02
        4.9652e+01 7.4558e+01 1.4285e+02
        5.1049e+01 7.6879e+01 1.4503e+02
        5.2485e+01 7.9235e+01 1.4721e+02
        5.3962e+01 8.1626e+01 1.4939e+02
        5.5480e+01 8.4050e+01 1.5159e+02
        5.7041e+01 8.6508e+01 1.5378e+02
        5.8646e+01 8.8998e+01 1.5599e+02
        6.0296e+01 9.1521e+01 1.5820e+02
        6.1992e+01 9.4075e+01 1.6042e+02