Abstract
The electron-paramagnetic-resonance spectrum of ${\mathrm{Pd}}^{3+}$ was studied in a single crystal of CaO at X-band frequency. The spectrum exhibits an intermediate quadrupole interaction and a static Jahn-Teller effect. The Jahn-Teller distortions produce the electric field gradient required for the quadrupole interaction. At high temperatures the spectrum is isotropic, and at low temperatures it consists of a superposition of three tetragonal spectra. It could be concluded that the first excited vibronic level is a singlet ${A}_{1}$ and \ensuremath{\delta}\ifmmode\bar\else\textasciimacron\fi{}/3\ensuremath{\Gamma}\ensuremath{\approxeq}5. The anomalous effects in the hyperfine structure, caused by the relatively large quadrupole interaction (Q/${A}_{\ensuremath{\perp}}$\ensuremath{\approxeq}0.59), were interpreted by an exact diagonalization of the spin Hamiltonian.
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