Dynamic Nuclear Polarization

Abstract

Saturation of thc microwave electron paramagnetic resonance of impurities in various materials produces enhanced and reversed nuclear polarization throughout the material. This effect was investigated and is discussed in some detail for LiF single crystals. Results for other materials at microwave frequencies between 8 and 10 kMc/sec and temperatures between 1.2 and 1.6 K are presented. The variety of materials yielding a measurable effect suggests that this is a very general way of polarizing nuclei. (W.D.M.)