Gas-phase nuclear magnetic relaxation in 129 Xe revisited

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DOIResolve DOI: http://doi.org/10.1063/1.1337804
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TypeArticle
Journal titleThe Journal Of Chemical Physics
Volume114
Issue5
Pages21732181; # of pages: 9
Subjectchemical shift; nuclear spin-lattice relaxation; xenon
AbstractIn this contribution gas-phase 129Xe spin-lattice relaxation time measurements are extended to conditions (pressure, temperature, magnetic-field strength, isotope composition) not previously used. It is shown that wall effects become apparent at densities below ~20 amagat, and that these become dominant below ~3 amagat. A significant new discovery from field-dependent studies is that, in addition to the previously identified field-independent spin�rotation relaxation operative in the bulk gas, there is a contribution from the modulation of the chemical shift that depends on the square of the applied magnetic-field strength. The weak temperature dependence of the relaxation times can be understood in terms of the opposite temperature coefficients of the field-independent and field-dependent contributions to the relaxation. The spin�rotation contribution and its temperature dependence are calculated and found to be in good agreement with the experimental data. The low field, low density limit for the relaxation time is 56.3�2.6 hr�amagat at 295 K in the absence of wall effects.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12328501
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Record identifierd39b9e23-75b6-43d4-827c-8bd3053cec94
Record created2009-09-10
Record modified2017-03-23
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