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## Main Question or Discussion Point

Towards the end of my atomic and quantum course my lecturer makes a note of residual Coulomb interaction and does a few graphs to show the concequences of it are (such as some states not being allowed do to symmetry) and that they favour larger values of angular momentum, but does'nt really explain very well what it acually is and where it comes from. I was wondering if somebody could acually explain to me then what residual Coulomb interaction is and why it exists?

my first thoughts are that it may be due to the fluxuations of charge around the nucleus of an atom as the Hartree-Fock approximation ignores this and so that theory does'nt match what we see but thats the limit to my understanding.

Thanks

my first thoughts are that it may be due to the fluxuations of charge around the nucleus of an atom as the Hartree-Fock approximation ignores this and so that theory does'nt match what we see but thats the limit to my understanding.

Thanks