Electron paramagnetic resonance instrument with superconductive

Details Electron paramagnetic resonance instrument with superconductive Electron paramagnetic resonance instrument with superconductive

1989-11-16

1991-07-09

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using an electron resonance spectrometer system

333995, G01R 3320

Patent

active

050309145

ABSTRACT:
The EPR instrument includes an X-band klystron used to generate microwave power that is transmitted to a superconductive waveguide cavity resonator. The cavity is placed between the pole pieces of a large d-c magnet and small a-c magnet coils energized by a modulation signal source. A microwave crystal detector detects RF energy outputted from the cavity. The detector output is amplified, rectified and filtered in a phase sensitive filter that uses the modulation signal source as a reference. The resultant signal is recorded by an amplitude vs. time recorder. The superconductive cavity includes an inner wall of high-temperature superconductive material, a liquid coolant and an insulating sleeve that passes through the cavity. The specimen to be analyzed is placed in the sleeve.

REFERENCES:
patent: 4674513 (1987-06-01), Jasper, Jr.
patent: 4870052 (1989-09-01), Engler
"A Coaxial Microwave Cavity for Improved Electron Paramagnetic Resonance Sensitivity with Lossy Solvents", Journal of Magnetic Resonance by Robert Allendoerfer and James Carroll, Jr., 37, pp. 497-508 (1980).
M. A. Foster, "Magnetic Resonance in Medicine & Biology", Pentagon Press, copyright 1984.

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