The electric field shift in paramagnetic resonance has been studied for the rare-earth ions Ce, Nd, Er, and Yb in a CaWO₄ lattice by means of electron spin echoes. In each case the four coefficients of the electric effect tensor have been obtained. A simple way of visualizing the changes which occur in the spin resonance of a Kramers doublet when an electric field is applied has been given in terms of the g ellipsoid. The symmetry of the paramagnetic site, and the possibility of observing electric spin resonance in suitable materials is discussed.
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W. B. Mims (1965) studied this question.
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