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I would just like to understand how to use the above Dirac energy equation to calculate (for example) the 1s-2s transition frequency in hydgrogen. Does one substitute n=1, j=0 for 1s energy level and n=2, j=0 for 2s energy level ?

From previous reading I understand the mass referred to in the formula will need to be the reduced electron mass.

The graphic comes from this reference.

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# I Use the Dirac Equation to calculate transition frequencies in Hydrogen

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