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The reflectivity of single-crystalline CoO has been studied by opticalspectroscopy for wave numbers ranging from 100 to 28,000\wn and fortemperatures 8 $< T <$ 325 K\@. A splitting of the cubic IR-active phonon modeon passing the antiferromagnetic phase transition at $T_N$ = 289 K has beenobserved. At low temperatures the splitting amounts to 15.0\wn. In addition, westudied the splitting of the cubic crystal field ground state of the Co$^{2+}$ions due to spin-orbit coupling, a tetragonal crystal field, and exchangeinteraction. Below $T_N$, magnetic dipole transitions between theexchange-split levels are identified and the energy-level scheme can be welldescribed with a spin-orbit coupling $\lambda = 151.1\wn$, an exchange constant$J = 17.5\wn$, and a tetragonal crystal-field parameter $D = -47.8\wn$. Alreadyin the paramagnetic state electric quadrupole transitions between thespin-orbit split level have been observed. At high frequencies, two electroniclevels of the crystal-field-split $d$-manifold were identified at 8,000 and18,500\wn.

Optical Spectroscopy in CoO: Phonons, Electric, and Magnetic Excitations