1 Table of Contents: “... Transitions -- The Spin of the Electron -- Energy Splitting and Shift due to External Fields -- Many-Body...”

2 Table of Contents: “... -- 4 The Spin of the Electron -- 5 Energy Splitting and Shift due to External Fields -- 6 Many-Body...”

3 “... to the study of quantum atomic physics with special emphasis on the spin of the electron, which needs the Dirac...”