ELECTRONIC AND NUCLEAR PARAMAGNETISM AND ENERGY TRANSFER MECHANISMS IN CRYSTALLINE SOLIDS
SAINT LOUIS UNIV MO
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The enchancement of the Na23 nuclear magnetic resonance signal by means of the Solid Effect has been observed at 78 K in a sample of monocrystalline NaCl in which Cl2- molecular ions had been introduced by X-ray irradiation. A simple saturation theory for electronic transitions has been developed and checked against the data on EPR lines of both Cl2- centers in NaCl and KCl and of Mn ions in calcite. The relaxation time of the five Mn transitions have been calculated. Values of the microwave field required for such calculations have been measured in a novel fashion. The linewidth, saturability, and the T1 and T2 relaxation times for the invisible forbidden transitions have been obtained, and with these the observed variation of enhancement with applied power has been predicted. Having estimated tcl2- centers, the number of Na23 nuclei polarized per Cl2- center was calculated to be in the order of 10 to the 5th.
- Atomic and Molecular Physics and Spectroscopy