Zeeman Effect and Configuration Interaction in Germanium*

The Zeeman effect of Ge i and Ge ii is investigated both experimentally and theoretically. In many configurations, intermediate-coupling wavefunctions derived by energy-level fitting show large departures from all of the pure-basis couplings LS, LK, jK, and jj, and the computed g values depart correspondingly from the pure-coupling values. Provided important configuration-interaction effects are taken into account, the calculated g values are found to agree well with observation. Strong wavefunction mixing in the configurations Ge i 4p4f and Ge ii 4f is produced by the magnetic field (24025 G); the theoretically calculated effects agree well with observation.