The conduction band of InSb exhibits a spin splitting equal to delta ok3. This splitting is responsible for the dipole active spin resonance recently observed. This resonance can interfere with its quadrupole active counterpart. From the magnitude of this interference accurate values of the magnitude of delta o have been recently determined. The authors compare here these values with calculations using the LMTO method and with the results of k.p perturbation calculations. The sign of delta o is also unambiguously determined and shown to agree with theoretical predictions.
 

Solid State Communications, 60 17-19, 1986.