Nuclear spin relaxation of D/sub 2/ in deuterium gas and in solid argon
Nuclear spin relaxation times have been measured for molecular deuterium, both as a pure gas and as a dilute impurity in a host matrix of solid argon. In the gas, T/sub 1/ was measured as function of temperature and of the density p, over the ranges from 25 to 125 K and from 2 to 12 amagat, and the measurements are consistent with a model of a primary relaxation mechanism resulting from an intramolecular interaction with the molecular angular momentum, which as fluctuating components because of collisions between gas molecules. T/sub 1/ and T/sup 2/ of p-D/sub 2/ were measured for dilute mixtures of molecular deuterium in solid argon at temperatures from 5.6 to 55 K. The primary relaxation mechanism in these mixtures is, as for the gaseous samples, the intramolecular interaction with the fluctuating molecular spin; in this case, the molecular spin fluctuations are caused by phonon induced modulation of electric field gradients at the molecular sites. The results can described by Fedders' calculation of the intramolecular interaction, and by the Van Kronendank and Walker model of anharmonic phonon interactions with the molecular quadrupole moment. The mixture samples were mixed in the liquid phase, and then frozen. T/sub 1/ was also measured in the liquid mixtures, and line shape spectra were recorded. A shift of the deuterium resonance frequency was observed between gas phase and liquid phase mixtures. All of the relaxation time measurements were performed using pulsed NMR techniques, at a frequency of 55 MHz in a 8.5 T superconducting magnet. A liquid helium flow cryostat system was used to control the temperature of the samples.
- Research Organization:
- Washington Univ., St. Louis, MO (USA)
- OSTI ID:
- 7200587
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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