Magnetic field dependent xenon-131 quadrupolar splitting in gas and liquid phase NMR

At very high magnetic fields \(B0>=14 T\), the NMR spectrum of xenon-131 in the gas phase \(∼300 K,400 kPa\) shows a well resolved quadrupolar splitting. The experimental results suggest a dual nature of the observed splitting. One portion arises from exchange with xenon atoms adsorbed on the surface of the surrounding container wall. Another portion, previously unreported, is strongly field dependent and does not appear to originate from such surface interactions. This term indicates an electrical polarization of the xenon electron shell induced by the applied static magnetic field.