Jahn-Teller Effect of ad1Ion in Eightfold Cubic Coordination

Abstract

The paramagnetic resonance of ${\mathrm{Sc}}^{2+}\left(3\mathrm{}{d}^1\right)$ exhibits three different kinds of spectra as the temperature is raised from 1.5 to 77°K. They are all explained in terms of internal asymmetry due to electronic-vibrational coupling (Jahn-Teller effect). Quantum-mechanical tunneling, as well as relaxation and strain, have an effect on the paramagnetic-resonance transitions. The first two effects are used to determine the symmetry and the energy level of the lowest vibronic states. From this an estimate of the parameters which describe the Jahn-Teller potential is made.