Main Question or Discussion Point
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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