Powder Zeeman Study of the Nuclear Quadrupole Resonance Lower Transition Spectrum for I = 5/2; Application to Orthoperiodic Acid

The Zeeman effect of the nuclear quadrupole resonance (NQR) lower transition (± 3/2 ↔ 1/2) spectrum for I=5/2 in crystalline powder has been studied and the frequency splittings of the ±3/2 ↔ ± 1/2 transition line have been plotted as a function of the asymmetry parameter η and the external magnetic field H. The experimental Zeeman frequency splittings of the 127I lower transition line in crystalline powder of H5IO6 have been compared with the theoretical values in order to evaluate η. The present value of η agrees with the earlier values reported from the two transition frequencies and also from a single crystal Zeeman study on the ± 3/2 ↔ ± 1/2 transition line.