The Zeeman-split quadrupolar resonances for Ba137 in BaBr2·2H2O were measured by using coincident enhanced proton resonance as a detector. The principal axes of the electric field gradient were found to be oriented thus: x parallel to b, y parallel to c, and z perpendicular to the bc plane. a, b and c are the crystallographic axes. The asymmetry parameter is 0.73±0.01 and the pure quadrupole resonance frequency is 24.38±0.03 Mc/sec.
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McGrath et al. (1962) studied this question.
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