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## Homework Statement

Okay, I need to work out the Relativistic corrections for an atom, using the First KE Term and the Darwin Term:

*Calculate the energy shift of the protonium groundstate due to the relativistic correction to the kinetic energy and the Darwin term and compare it to Hydrogen*

## Homework Equations

KE Term:

[tex] \Delta E_1 = \frac{1}{2}mc^2 \frac{(z\alpha)^4}{n^4}\left( \frac{n}{l + \frac{1}{2}} - \frac{3}{4}\right) [/tex]

Darwin Term:

[tex] \Delta E_3 = \frac{1}{2}mc^2 \frac{(z\alpha)^4}{n^3} [/tex]

## The Attempt at a Solution

I know I just need to insert the values into these equations to get out the answer. However I am niot quite sure what the alpha represents?

TFM