# The Electromagnetic shift of energy levels

@article{Bethe1947TheES, title={The Electromagnetic shift of energy levels}, author={Hans Albrecht Bethe}, journal={Physical Review}, year={1947}, volume={72}, pages={339-341} }

B very beautiful experiments, Lamb and Retherford1 have shown that the fine structure of the second quantum state of hydrogen does not agree with the prediction of the Dirac theory. The 2s level, which according to Dirac’s theory should coincide with the 2p 1 2 level, is actually higher than the latter by an amount of about 0.033 cm−1 or 1000 megacycles. This discrepancy had long been suspected from spectroscopic measurements.23 However, so far no satisfactory theoretical explanation has been…

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