I am reading the fine structure article from Wikipedia at http://en.wikipedia.org/wiki/Fine_structure.(adsbygoogle = window.adsbygoogle || []).push({});

Under the heading 'Kinetic energy relativistic correction', we have the following:

For the hydrogen atom, V = e^{2}/r. This implies that the expectation of V = -e^{2}/a_{0}n^{2}.

Now, I know that you use the unperturbed wavefunction ψ^{0}to find the expectation of V, but I am not sure of the exact form of ψ^{0}. Any help on this will be greatly appreciated.

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# Calculating the expectation of a quantity using wavefunctions

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