
The displacement between the $2s$ and $2{p}_{\frac{1}{2}}$ levels of hydrogen is calculated on the assumption that it is caused by interaction with the radiation field; the calculation is relativistic, but the spin of the electron is neglected. The theory gives a finite result, agreeing closely with the experimental value.
Quantum theory
Quantum theory
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 22 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 1% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |
