Zeeman effect of J=2 states of Sr: g-factor variation for interacting Rydberg series

Measurements of the g factor for a series of bound, 5snd J=2 states in Sr, in the region of an avoided crossing between D21 and D23 Rydberg series, show a variation which is in agreement with the prediction of multichannel quantum-defect theory. The g factor was measured by multiphonon ionization spectroscopy. The dependence of ionization signal on laser polarization was also studied. © 1977 The American Physical Society.