Local Magnetic Field Shift in Liquid and Solid Xenon

Abstract

Additional nuclear-magnetic-resonance measurements have been made of the temperature and density dependence of the average local magnetic field at ${\mathrm{Xe}}^{129}$ nuclei in liquid and solid xenon samples in an external magnetic field ${H}_{0}$. We have extended the temperature range of our solid measurements down to 21\ifmmode^\circ\else\textdegree\fi{}K, and a computer of average transients has been used to improve the signal-to-noise ratio and reduce the effects of random errors. Our new liquid data covering the density range from 423 amagat to the triple point at 523 amagat show a linear dependence of the local field on density. The rate of increase of this local field with liquid density is 5.66 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}7}$ ${H}_{0}$ G/amagat. The new data for the extended solid range from 577 amagat (triple point) to 639 amagat (21\ifmmode^\circ\else\textdegree\fi{}K) show a nonlinear density dependence. The rate of increase of the local field with solid density $\ensuremath{\rho}$ is $5.10\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}{H}_{0}\ensuremath{-}7.42\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}\ensuremath{\rho}{H}_{0}$ G/amagat. The new data confirm the previously established discrepancy between the solid density dependence measured in this laboratory and the dependence measured by Yen, Norberg, and Warren. This discrepancy remains unexplained.