%0 Journal Article %J Chemical Physics Letters %D 1993 %T Nmr-Study of Xenon Dynamics and Energetics in Na-a Zeolite %A Larsen, R. G. %A Shore, J. %A Schmidt-Rohr, K. %A Emsley, L. %A Long, H. %A Pines, A. %A Janicke, M. %A Chmelka, B. F. %K xe %X

For xenon atoms adsorbed in Na-A zeolite, electronic interactions cause shifts in NMR frequencies, resulting in a spectrum with discrete peaks from xenon atoms in cages with different xenon occupancies. Using two-dimensional exchange NMR, it is possible to determine the microscopic rates of intercage motion and to relate them to the adsorption and activation energies of the xenon atoms. The dependence of the adsorption energies on xenon cage occupancy reflects the importance of the intercage interactions and is directly related to the cage occupancy distribution. Variable temperature measurements yield an activation energy of about 60 kJ/mol for the transfer of a xenon from one cage to another.

%B Chemical Physics Letters %V 214 %P 220-226 %8 Oct 29 %@ 0009-2614 %G English %U ://WOS:A1993MD61400015 %N 2 %M WOS:A1993MD61400015 %! Nmr-Study of Xenon Dynamics and Energetics in Na-a Zeolite %R Doi 10.1016/0009-2614(93)90085-F %0 Journal Article %J Chemical Physics Letters %D 1992 %T Nmr of Optically Pumped Xenon Thin-Films %A Raftery, D. %A Long, H. %A Reven, L. %A Tang, P. %A Pines, A. %X

NMR of Xe-129 has been observed in thin films of xenon frozen onto the surfaces of glass sample cells with various geometries. The Xe-129 polarization was enhanced by optical pumping, and the xenon was then transferred to a high-field pulsed NMR spectrometer allowing the observation of strong signals from xenon films of approximately 1-mu-m thickness. The line shape depends on the film geometry because of the bulk diamagnetic susceptibility chi(D) of solid xenon. The spectral line shape and resonance frequency also depend on temperature.

%B Chemical Physics Letters %V 191 %P 385-390 %8 Apr 10 %@ 0009-2614 %G English %U ://WOS:A1992HP50100002 %N 5 %M WOS:A1992HP50100002 %! Nmr of Optically Pumped Xenon Thin-Films %R Doi 10.1016/0009-2614(92)85396-R