Fine Structure of the Hydrogen Atom. V

Abstract

Improvements in apparatus and techniques of measurement of the $2^{2}S_{\frac{1}{2}}\ensuremath{-}2^{2}P_{\frac{1}{2}}$ level shifts in hydrogen and deuterium are described. The more accurate results are ${\mathcal{S}}_{\mathrm{H}}=1057.77\ifmmode\pm\else\textpm\fi{}0.10$ Mc/sec and ${\mathcal{S}}_{\mathrm{D}}=1059.00\ifmmode\pm\else\textpm\fi{}0.10$ Mc/sec. These values are compared with results of quantum electrodynamic calculations.