Small splitting between 2S₁/₂ and 2P₁/₂ levels of hydrogen (≈ 1058 MHz), predicted by QED radiative corrections. Historical cornerstone of QED.
Small splitting between 2S₁/₂ and 2P₁/₂ levels of hydrogen (≈ 1058 MHz), predicted by QED radiative corrections. Historical cornerstone of QED.