Electron paramagnetic resonance study of the Cu2+ doped into KHCO3 single crystals has revealed that it is of axial symmetry. The g-values of Cu2+ are very nearly identical to some known Cu2+ in square-planar coordinations. The resonance linewidth is relatively narrow, such that the hyperfine patterns of Cu63 and Cu65 can be resolved. Moreover, the observation of the forbidden transitions induced by the Cu nuclear electric quadrupole interaction permits a test of the usual hypothesis that the g-factor, the hyperfine interaction, and the nuclear electric quadrupole interaction share a common set of principal axes.
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