MAGNETIC-FIELD DEPENDENT XE-131 QUADRUPOLAR SPLITTING IN GAS AND LIQUID-PHASE NMR

At very high magnetic fields (B-0 greater than or equal to 14 T), the NMR spectrum of xenon-131 in the gas phase (similar to 300 K,400 kPa) shows a well resolved quadrupolar splitting. The experimental results suggest a dual nature of the observed splitting. One portion arises fr om exchange with xenon atoms adsorbed on the surface of the surroundin g container wall. Another portion, previously unreported, is strongly field dependent and does not appear to originate from such surface int eractions. This term indicates an electrical polarization of the xenon electron shell induced by the applied static magnetic field. [S0031-9 007(98)06807-0].