Abstract
Electron paramagnetic resonance study of the Cu 2+ doped into KHCO 3 single crystals has revealed that it is of axial symmetry. The g-values of Cu 2+ are very nearly identical to some known Cu 2+ in square-planar coordinations. The resonance linewidth is relatively narrow, such that the hyperfine patterns of Cu 63 and Cu 65 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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