Claims
- 1. An EPR instrument comprising:
- a microwave power source;
- a high-Q microwave resonant cavity having an inner surface of superconductive material coupled to said source and having an output;
- a magnetic means for applying a variable magnetic field to said cavity; and
- means for detecting RF power transmitted from the output of said cavity.
- 2. The instrument of claim 1 wherein said cavity includes an opening passing through the section of high RF power concentration.
- 3. The instrument of claim 2 wherein said cavity has a hollow wall surrounding the superconductive material and further includes a liquid coolant contained in said hollow wall having a temperature below the critical temperature of said superconductive material.
- 4. The instrument of claim 3 further including a dielectric insulating sleeve mounted in said opening.
- 5. The instrument of claim 4 wherein said power source is an X-band klystron.
- 6. The instrument of claim 4 wherein the loaded Q-factor for said resonant cavity is greater than 10.sup.6.
- 7. An EPR instrument comprising:
- a microwave power source;
- a microwave resonant cavity having an unloaded Q-factor much greater than 10.sup.6 wherein the inner surface of said cavity has substantially no resistance to electrical currents;
- means for applying a variable magnetic field to said cavity; and
- means for detecting RF power transmitted from the cavity.
- 8. The instrument of claim 7 wherein said cavity has means for placing a sample at the point of greatest RF power concentration in the cavity.
- 9. The instrument of claim 8 wherein said inner surface of said cavity is lined with a superconductive material.
- 10. The instrument of claim 9 wherein said cavity includes means for cooling said superconductive surface at least to the critical temperature thereof.
- 11. The instrument of claim 10 wherein said means for cooling includes a reservoir of liquid coolant surrounding said superconductive material.
Government Interests
The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to me of any royalty thereon.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4674513 |
Jasper, Jr. |
Jun 1987 |
|
4870052 |
Engler |
Sep 1989 |
|
Non-Patent Literature Citations (2)
Entry |
"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. |