Proton spin-lattice relaxation in some paramagnetically adulterated hydrocarbon gases

Lipsicas, M.; Siegel, Mel; Piott, J. E.; Higgins, Thomas J.; Gerber, Justin

doi:10.1016/0022-2364(76)90305-x

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…Even if this were the case, it is unlikely that our data are susceptible to a similar bias. 3 He is an inert gas and during the preparation of our samples we repeatedly exposed the glass ampoules to 13 The value F͑V , T͒ = 1.7 reported by Saam et al NO gas and employed an in situ fractional distillation procedure to remove unwanted chemical species. This assertion is further reinforced by the fact that we have observed no change in the 3 He nuclear relaxation times for these cells over a time period of four years.…”

Section: Examples Of Typical Fft Inversion-recovery and Saturation-mentioning

confidence: 99%

Nuclear relaxation ofHe3in the presence ofNO

Archibald¹,

Brief²,

Lei³

et al. 2006

Phys. Rev. A

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By virtue of the fact that its low-lying 2 ⌸ 3/2 state is paramagnetic, nitric oxide ͑NO͒ can be an effective agent for inducing nuclear spin relaxation during isolated binary collisions with other species. At the same time, the strong coupling between the electronic angular momentum and the internuclear axis of this particular molecule leads to a situation in which its effective magnetic moment depends critically on molecular motions that take place on the time scale of the collision. Here we present the results of an investigation in which the NMR-detected longitudinal nuclear relaxation rate T 1 −1 of room temperature 3 He gas adulterated with NO was measured as a function of NO density ͓͑NO͔͒ in two different magnetic fields. We find T 1 −1 = 0.0502͑3͒ ϫ͓NO͔ s −1 at 1.50 T, and T 1 −1 = 0.0506͑3͓͒NO͔ s −1 at 2.35 T, where ͓NO͔ is expressed in amagat. Under these conditions approximately two-thirds of the NO molecules occupy the diamagnetic 2 ⌸ 1/2 ground state and one-third occupy the paramagnetic 2 ⌸ 3/2 state. Our data can be understood in terms of a semiclassical treatment of collision dynamics that involves the paramagnetic moment autocorrelation function.

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Section: Examples Of Typical Fft Inversion-recovery and Saturation-mentioning

confidence: 99%

Nuclear relaxation ofHe3in the presence ofNO

Archibald¹,

Brief²,

Lei³

et al. 2006

Phys. Rev. A

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Nuclear spin relaxation by intermolecular magnetic dipole coupling in the gas phase. 129Xe in oxygen

Jameson

Hwang

1988

The Journal of Chemical Physics

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The nuclear spin relaxation times (T1) of 129Xe in xenon–O2 gas mixtures have been measured as a function of temperature and density at different magnetic fields. This system is used to characterize the intermolecular dipolar relaxation of nuclear spins in the gas phase. An empirical Boltzmann-averaged collision cross section associated with the collision-induced transitions between 129Xe nuclear spin states is obtained as a function of temperature.

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Proton spin-lattice relaxation in some paramagnetically adulterated hydrocarbon gases

Cited by 2 publications

References 19 publications

Nuclear relaxation ofHe3in the presence ofNO

Nuclear relaxation ofHe3in the presence ofNO

Nuclear spin relaxation by intermolecular magnetic dipole coupling in the gas phase. 129Xe in oxygen

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