Electric field effects in nuclear magnetic resonance

Abstract
Electric field effects have been detected in the 14N N.M.R. spectra of nitrobenzene and nitromethane. Application of an electric field induces molecular alignment in the liquid. The quadrupolar interaction is then not averaged out and line splitting results. The alignments measured in the pure liquids show that the Lorentz and Onsager local field models are not valid in these liquids at room temperature. Comparison of the measured alignments of nitrobenzene with those obtained from the Kerr effect show fair agreement. Double quantum transitions have been detected in the electric field N.M.R. spectrum of nitromethane.