# In the class lecture notes, the result of the first-order perturbation calculation for the energy of...

In the class lecture notes, the result of the first-order perturbation calculation for the energy of lithium was given as E(1) = 2J, +J Lists – K,625 - This energy is added to the E© value obtained by treating each electron as if it were in an independent hydrogen-like orbital in order to estimate the total energy of the lithium atom. 1s 2s The calculation to determine the E9) energy correction involves solving many integrals because the wavefunction for lithium has 6 terms, the Hamiltonian has 3 pairwise electron-electron potential terms and E" = (410Â°4). Two of the many integrals are shown below. Show all of the work necessary to evaluate these integrals in terms of Jij and Kij. + 1. \$1\$(1)a(1)15*(2)\$(2)2*(3)a^(3) * * * (1)a(1)14(2)(2)2-(3)a(3)dt 2. ſ 1s (1)c*(1)is* (2) ** (2)2s* (3)aº(3), * * 25(1)(1)1s(2)6(2)1=(3)a(3)dt ri2 '13

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