Electric effects in paramagnetic resonance

More than ten years have passed since discovery of the electric effect in paramagnetic resonance, but the number of investigations devoted to it has been large and increasing steadily. New phenomena related to this effect have been observed, and ways of its practical utilization have been indicated. The nature of the phenomenon is now understood, and the "phenomenological" description can be regarded as developed, although the quantitative theory leaves something to be desired. The article presents a review of work on the influence of the electric field on the paramagnetic-resonance spectrum. Principal attention is paid to electric effects in electron paramagnetic resonance and in electron nuclear double resonance. Effects in nuclear magnetic resonance (including quadrupole resonance), combined resonance, and optics are discussed in less detail, but all the studies known to the author are noted. The reviewed articles are grouped by topics, without observing chronological order.