Theory of the Microwave Zeeman Effect in Atomic Oxygen

Slight deviations of the coefficient of the linear Zeeman term from the elementary Landé value arise from the following effects: ($a$) small departures from Russell-Saunders (R-S) coupling, ($b$) the motion of the nucleus, ($c$) relativity corrections, ($d$) interplay between the magnetic field and various kinds of magnetic interactions within the atom, and ($e$) the Schwinger electro-dynamical corrections. In the present paper an effort is made to estimate the magnitude of the effects ($a$), ($b$), ($c$), ($d$) with the goal of examining whether the residual discrepancy between Rawson and Beringer's measurements on oxygen and the ideal Landé value is in accord with Schwinger's formula for ($e$).