The exact energy of a ground-state He atom is 79.01 eV. Calculate the correlation energy and the
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TABLE 21.1 Total Energy and 1s Orbital Energy for He for Three Different Basis Sets Used to Represent the 15 Orbital Number of Exponents, §; Total Energy of He, Eotal (eV) Is Orbital Etotal – 2€1, (eV) Basis Energy, £1, (eV) Functions, m 1.41714, 2.37682, 4.39628, 6.52699, 5 -77.8703 -27.9129 -24.9787 7.94252 2.91093, 1.45363 -77.8701 -24.9787 -27.9133 1 1.68750 -77.4887 -24.3945 -28.6998
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