Zeeman effect in the ground multiplet of samarium

Abstract

Abstract The values of gJ for all the levels of the ground term 7F of samarium have been measured by the method of magnetic resonance in an atomic beam. These are JgJJgJ 1 1·49840 ± 0·00005 4 1·49625 ± 0·00004 2 1·49779 ± 0·00003 5 1·49533 ± 0·00006 3 1·49707 ± 0·00003 6 1·49419 ± 0·00010 A theoretical calculation of some of the corrections to the Landé g-value is presented. These corrections arise from the breakdown of Russell-Saunders coupling and from rela­tivistic and diamagnetic effects. While the numerical agreement with experiment appears superficially to be good, it is shown, by a consideration of the J-dependence of the theoretical corrections, that certain significant discrepancies remain. A new measurement of gJ for the ground state of europium is also reported and discussed. It is gJ (Eu8S7/2) = 1·99340 ± 0·00007.