Resonance Absorption of Microwaves by Paramagnetic Substances
Abstract
The phenomenon of resonance absorption of electromagnetic waves of microwave frequencies by paramagnetic substances was first observed in hydrated crystals of ions of the elements in the iron transition group by Zavisky (1) in 1945. Since that time the experimental technique of microwave absorption, accompanied by successful quantum theoretical interpretation of the phenomenon, has proved to be an important tool for throwing additional light on the properties of paramagnetic crystals beyond that which had been shed on the matter previously by means of infrared, magnetic susceptibilities, the X-ray, and specific heat measurements. The refinement of the experimental technique in subsequent years has eventually led to the discovery of nuclear effects upon the resonance absorption in the form of the hyperfine structure in the absorption curve. Since the first discovery of this effect by Penrose (2) in copper ions of sulphate crystals similar effects have been observed in several other paramagnetic crystals, leading to the determination of the spin and the magnetic moments of some of the nuclei of the paramagnetic atoms. Recently Bleaney was able to determine the ratio of the nuclear electric quadrupole moments of the copper isotopes from experimental observations of the hyperfine effects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 22, 1952
- Accession Number
- AD1218920
Entities
People
- Chihiro Kikuchi
- Walter W. Wada
Organizations
- United States Naval Research Laboratory