Accession Number:

AD0611184

Title:

ELECTRONIC AND NUCLEAR PARAMAGNETISM AND ENERGY EXCHANGE MECHANISMS.

Descriptive Note:

Annual technical rept. (Interim rept. no. 1) Sep 63-Sep 64,

Corporate Author:

SAINT LOUIS UNIV MO

Report Date:

1964-12-01

Pagination or Media Count:

119.0

Abstract:

In this experimentation it has been shown that the Na and Li nuclear magnetic resonance signal may be enhanced in NaCl and LiF by the EPR pumping of forbidden transitions in which advantage is taken of the coupling between the Cl2- center or the F2- center and the host alkali nucleus. Evidently these centers affect the adjacent anion nuclei first and then this local polarization becomes rapidly diffused from one alkali nucleus to the next. This requires a spin diffusion rate which is fast compared to the nuclear spin lattice relaxation rate. A successful phenomenological theory has been developed to explain these effects at liquid N2 temperatures. An enhancement of 18 of the A127 nuclear magnetic signal by means of the Solid Effect has been observed at 78K in a sample of Al203 doped with small amounts of CrIII. Will the data on the Al in CrIII doped Al2O3 follow the proposed phenomenological theory of the Solid State Effect. The basic work on spin diffusion as summarized in Section 4 should provide a solid theoretical foundation for the phenomenological theory. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE