ELECTRONIC AND NUCLEAR PARAMAGNETISM AND ENERGY EXCHANGE MECHANISMS.
Abstract
The Na23 NMR enhancement data obtained by pumping the C12 ESR line in x-ray irriadiated NaC1 crystals have been examined on the basis of a new theorectical model. This model assumes that the Na nuclei which can be polarized directly by pumping the forbidden transitions of the system are only those contained in a spherical shell between the diffusion barrier radius and the scattering length, and that the nuclear polarization originating in the shell diffuses freely throughout the Na nuclei in the system. Various types of theoretical expressions derived from the model are found to be in good agreement with experimental data. The investigation of the Solid State Effect in A1203 containing Cr+++ ions has been continued. It was found that the A127 NMR signal could be enhanced even at room temperature as well as at liquid nitrogen temperature. Detailed measurements have shown that the A127 NMR enhancement does not follow the shape of the first derivative line of the Cr+++ ESR spectrum; substantial deviations have been observed. These deviations have been attributed to the homogeneous broadening of the Cr+++ ESR line. During the past period, two new research projects have been initiated. The first project deals with investigations of the Solid State Effect in crystalline solids in which the ESR centers possess an asymmetric g- and/or hyperfine-tensor. The second research effort is concerned with double resonance experiments on CaF2 containing atomic hydrogen centers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1966
- Accession Number
- AD0487542
Entities
People
- Sook Lee
- Vincent P. Jacobsmeyer
Organizations
- Saint Louis University