Zeeman Effect of R Lines in TlCr-alum

Zeeman effect of R 1 (14943.0 cm -1 ) and R 2 (14945.0 cm -1 ) absorption lines in TlCr-alum was studied in magnetic fields up to 27 kOe at liq. He temperature. The R 1 and R 2 lines are ascribed to the magnetic dipole transitions from 4 A 2 ground state to E and 2 A excited states of 2 E , respectively. The Agreement between the experimental and the predicted Zeeman patterns is quite good. The angular dependence of g -values of the excited states is explained by using the effective Hamiltonian, however, it is difficult to give a consistent explanation of the g -values in terms of the perturbation expression which are currently available. Paschen-Back effects of the R lines was observed in pulsed magnetic fields up to 220 kOe at 77°K. These patterns are interpreted consistently in terms of the above assignment.