I'm trying to follow some working by lecturer;(adsbygoogle = window.adsbygoogle || []).push({});

Treating delK (previously found in first bit of question), show that the energy En of the usual hydrogenic state [nlm> is shifted by some expression given.

basically we start with

[tex]

\[

\frac{1}{2m_{0}c^{2}} \left\langle nlm\right|\left(\hat{H_{0}} - V\left(r\right)\right)^{2}\left|nlm\right\rangle

\]

[/tex]

and it goes to

[tex]

\[

\frac{1}{2m_{0}c^{2}} \left\langle nlm\right|\left(E_{n}+\frac{\alpha\hbar c}{r}\right)^{2}\left|nlm\right\rangle

\]

[/tex]

I don't understand what he has done top replace the H - V?

Cheers

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# Homework Help: Perturbation theory energy shift for hydrogen atom

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