NMR spin-rotation relaxation and diffusion of methane

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dc.citation.articleNumber204504
dc.citation.journalTitleThe Journal of Chemical Physics
dc.citation.volumeNumber148
dc.contributor.authorSinger, P.M.
dc.contributor.authorAsthagiri, D.
dc.contributor.authorChapman, W.G.
dc.contributor.authorHirasaki, G.J.
dc.date.accessioned2018-09-11T20:40:46Z
dc.date.available2018-09-11T20:40:46Z
dc.date.issued2018
dc.description.abstractThe translational diffusion-coefficient and the spin-rotation contribution to the 1H NMR relaxation rate for methane (CH4) are investigated using MD (molecular dynamics) simulations, over a wide range of densities and temperatures, spanning the liquid, supercritical, and gas phases. The simulated diffusion-coefficients agree well with measurements, without any adjustable parameters in the interpretation of the simulations. A minimization technique is developed to compute the angular velocity for non-rigid spherical molecules, which is used to simulate the autocorrelation function for spin-rotation interactions. With increasing diffusivity, the autocorrelation function shows increasing deviations from the single-exponential decay predicted by the Langevin theory for rigid spheres, and the deviations are quantified using inverse Laplace transforms. The 1H spin-rotation relaxation rate derived from the autocorrelation function using the “kinetic model” agrees well with measurements in the supercritical/gas phase, while the relaxation rate derived using the “diffusion model” agrees well with measurements in the liquid phase. 1H spin-rotation relaxation is shown to dominate over the MD-simulated 1H-1H dipole-dipole relaxation at high diffusivity, while the opposite is found at low diffusivity. At high diffusivity, the simulated spin-rotation correlation time agrees with the kinetic collision time for gases, which is used to derive a new expression for 1H spin-rotation relaxation, without any adjustable parameters.
dc.identifier.citationSinger, P.M., Asthagiri, D., Chapman, W.G., et al.. "NMR spin-rotation relaxation and diffusion of methane." <i>The Journal of Chemical Physics,</i> 148, (2018) AIP: https://doi.org/10.1063/1.5027097.
dc.identifier.doihttps://doi.org/10.1063/1.5027097
dc.identifier.urihttps://hdl.handle.net/1911/102502
dc.language.isoeng
dc.publisherAIP
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleNMR spin-rotation relaxation and diffusion of methane
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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