- #1
sridhar
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Homework Statement
Determine approximately the ground state energy of a helium like atom using first order perturbation theory in the electron-electron interaction.
Ignore the spins of the electrons and the Pauli principle.
Homework Equations
given that [tex]\int[/tex]d[tex]\tau[/tex]1[tex]\int[/tex]d[tex]\tau[/tex]2 e[tex]^-(r1+r2){}[/tex]/r1+r2 = 20[tex]\Pi[/tex][tex]^{2}[/tex]
The Attempt at a Solution
Consider a system where electron1-electron2 distance = r12
electron1-nucleus distance= r1
electron2-nucleus distance= r2
The S.E of this system would be exactly solvable if the term containing r12 disappears from the hamiltonian. Therefore we treat k/(r12)[tex]^{2}[/tex] as the perturbation!
I applied the first order perturbation for the term k/r12
the correction would basically be <[tex]\Psi[/tex] /k/(r12)[tex]^{2}[/tex] / [tex]\Psi[/tex]>
And i am stuck! Cant understand what to do next!