History and Some Aspects of the Lamb Shift

@article{Maclay2020HistoryAS,
  title={History and Some Aspects of the Lamb Shift},
  author={G. Jordan Maclay},
  journal={Physics},
  year={2020}
}
Radiation is a process common to classical and quantum systems with very different effects in each regime. In a quantum system, the interaction of a bound electron with its own radiation field leads to complex shifts in the energy levels of the electron, with the real part of the shift corresponding to a shift in the energy level and the imaginary part to the width of the energy level. The most celebrated radiative shift is the Lamb shift between the 2 s 1 / 2 and the 2 p 1 / 2 levels of the… 

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Measurements of the fine structure in the n = 2 states of antihydrogen, the antimatter counterpart of the hydrogen atom, are reported, finding that the classic Lamb shift in antiHydrogen is consistent with theory at a level of 11 per cent.
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