US3798532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron double resonance spectrometer with a microwave cavity bridge arrangement
Assignee: Individual
•
Filing: 1971-06-15
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Granted: 1974-03-19
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Expires: 1991-06-15
Abstract
Abstract In a spectrometer for measuring electron spin resonances a microwave cavity resonator is excited in a TEM mode such that the direction of the magnetic component of the microwave field is perpendicular to the direction of the magnetic component of a microwave field introduced in the cavity resonator by a helix giving broadband characteristics without tuning. A sample under test may be inserted in the helix for reaction by both the magnetic components of the microwave fields of the resonator and of the helix without interference. A spectrometer system is arranged to provide output spectrum from measurement of samples in the electron-electron double resonance mode, as well as in other modes.
Inventors
- 👤 K Hausser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:14
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/345; G01R33/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
Spectrometer apparatus for measuring electron spin resonances comprising microwave bridge means including a microwave cavity tuned for resonance at a single frequency, a frequency independent helix extending into said cavity with an axis oriented relative to the mode of excitation of said cavity such that the magnetic components of the microwave fields of said cavity and said helix are orthogonal to produce substantially complete decoupling of said fields, means connected to said bridge means for supplying microwave energy at a fixed frequency into said cavity to induce oscillations therein in the resonant mode of the cavity, means providing continuously variable frequency microwave energy to said helix, a sample disposed within the helix to be excited at the same time by the two orthogonal fields of said fixed frequency energy and variable frequency energy and means connected to said bridge means and to said means providing continuously variable frequency microwave energy for measuring the absorption of said fixed and variable energy by said sample.
Claim 2
Dependent Claim
163 words
Spectrometer apparatus for measuring electron spin resonances comprising microwave bridge means including a microwave cavity tuned for resonance at a single frequency, a frequency independent helix extending into said cavity with an axis oriented relative to the mode of excitation of said cavity such that the magnetic components of the microwave fields of said cavity and said helix are orthogonal to produce substantially complete decoupling of said fields, means connected to said bridge means for supplying microwave energy at a fixed frequency into said cavity to induce oscillations therein in the resonant mode of the cavity, means providing continuously variable frequency microwave energy to said helix, a sample disposed within the helix to be excited at the same time by the two orthogonal fields of said fixed frequency energy and variable frequency energy and means connected to said bridge means and to said means providing continuously variable frequency microwave energy for measuring the absorption of said fixed and variable energy by said sample.
Claim 3
Dependent Claim
17 words
Apparatus as defined in claim 1 including means amplitude modulating the microwave energy supplied to said helix.
Claim 4
Dependent Claim
26 words
Apparatus as defined in claim 1 wherein said means for measuring includes a recorder and means driving the recorder with a signal derived from the cavity.
Claim 5
Dependent Claim
32 words
Apparatus as defined in claim 3 including phase sensitive means processing the signal derived from the cavity in a phase comparison mode related to the microwave energy inducing oscillations in said cavity.
Claim 6
Dependent Claim
45 words
Apparatus as defined in claim 3 including means amplitude modulating with a known frequency signal the microwave energy supplied to the helix, and including phase sensitive means processing the signal derived from said cavity in a phase comparison mode related to said known frequency signal.
Claim 7
Dependent Claim
25 words
Apparatus as defined in claim 3 wherein the signals amplitude modulating the microwave energy supplied to said helix comprise square waves of a variable duration.
Claim 8
Dependent Claim
59 words
Apparatus as defined in claim 3 including means for operating the recorder to display the electron-electron spin double resonance spectrum with the variable frequency and the pumping frequency components set forth on orthogonal axes and amplitude modulating means for setting up a synchronous relationship between the variable frequency on one axis and the pumping frequency on the other axis.
References Cited (Backward Citations)
US3372331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |