US3678267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion source comprising a concave-shaped repeller
Assignee: US Philips Corp
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Filing: 1969-09-17
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Granted: 1972-07-18
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Expires: 1989-09-17
Abstract
Abstract An ion source in which gas is ionized by an electron beam in an ionizing space between a narrow extraction gap in an extraction electrode and an inner wall of a repeller electrode; the wall extending substantially parallel to the extraction gap with the open side of the wall facing the gap. The ions are drawn out of the ionizing space through an extraction electrode along electric fields produced by an acclerating electrode. The repeller electrode has a concave-shaped form for making the effective electric field of the ionizing space substantially independent of the accelerating voltage, thereby resulting in high extraction efficiencies.
Inventors
- 👤 Helmut Wilhelm Werner Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:40
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/10; H01J49/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
An ion source comprising an envelope containing an ionizable gas, a repeller electrode within said envelope having a reentrant wall portion wherein the reentrant wall portion of said repeller electrode forms a concave polygon having obtuse angles, an extraction electrode within said envelope having a narrow extraction gap spaced from and parallel to the reentrant wall portion of said repeller electrode and forming therewith an ionizing space in which the gas is ionized by an electron beam, and an acceleration electrode spaced from and parallel to said extracting electrode on the side opposite said repeller electrode and having a narrow exit aligned with said gap for providing an electric field within said ionizing space, the reentrant portion of said repeller electrode forming a concave cavity the wall of which tapers inwardly towards the extraction electrode to form an aperture of smaller cross-sectional area than portions further removed from said extraction electrode whereby the configuration of said electric field within said ionizing space is substantially independent of a voltage applied to said acceleration electrode.
Claim 2
Dependent Claim
173 words
An ion source comprising an envelope containing an ionizable gas, a repeller electrode within said envelope having a reentrant wall portion wherein the reentrant wall portion of said repeller electrode forms a concave polygon having obtuse angles, an extraction electrode within said envelope having a narrow extraction gap spaced from and parallel to the reentrant wall portion of said repeller electrode and forming therewith an ionizing space in which the gas is ionized by an electron beam, and an acceleration electrode spaced from and parallel to said extracting electrode on the side opposite said repeller electrode and having a narrow exit aligned with said gap for providing an electric field within said ionizing space, the reentrant portion of said repeller electrode forming a concave cavity the wall of which tapers inwardly towards the extraction electrode to form an aperture of smaller cross-sectional area than portions further removed from said extraction electrode whereby the configuration of said electric field within said ionizing space is substantially independent of a voltage applied to said acceleration electrode.
Claim 3
Dependent Claim
238 words
A mass spectrometer comprising an ion source, said ion source comprising an envelope containing an ionizable gas to be analyzed, a repeller electrode having a reentrant wall portion within said envelope, a substantially flat extraction electrode having a narrow extraction gap positioned spaced from and parallel to the reentrant wall portion of said repeller electrode forming therewith an ionizing space, an electron beam for ionizing said gas, and an acceleration electrode spaced from and parallel to said extracting electrode on the side opposite said repeller electrode and having a narrow exiting aperture aligned for providing an electric field for drawing ions out of said ionizing space, the reentrant portion of said repeller electrode forming a concave cavity, the wall of which tapers inwardly towards the extraction electrode to form an aperture of smaller cross-sectional area than portions further removed from said extraction electrode whereby the configuration of said electric field within said ionizing space is substantially independent of voltages applied to said acceleration electrode, ion detecting means, magnetic means positioned between said ion source and said ion detecting means for producing a magnetic sector field of constant magnetic strength for the spacial separation between ions of different masses, and means for varying the voltage of the acceleration electrode relative to said repeller electrode independently of the voltage of the extraction electrode relative to said repeller electrode for obtaining the mass spectrum of said gas in said ion source.
Claim 4
Dependent Claim
238 words
A mass spectrometer comprising an ion source, said ion source comprising an envelope containing an ionizable gas to be analyzed, a repeller electrode having a reentrant wall portion within said envelope, a substantially flat extraction electrode having a narrow extraction gap positioned spaced from and parallel to the reentrant wall portion of said repeller electrode forming therewith an ionizing space, an electron beam for ionizing said gas, and an acceleration electrode spaced from and parallel to said extracting electrode on the side opposite said repeller electrode and having a narrow exiting aperture aligned for providing an electric field for drawing ions out of said ionizing space, the reentrant portion of said repeller electrode forming a concave cavity, the wall of which tapers inwardly towards the extraction electrode to form an aperture of smaller cross-sectional area than portions further removed from said extraction electrode whereby the configuration of said electric field within said ionizing space is substantially independent of voltages applied to said acceleration electrode, ion detecting means, magnetic means positioned between said ion source and said ion detecting means for producing a magnetic sector field of constant magnetic strength for the spacial separation between ions of different masses, and means for varying the voltage of the acceleration electrode relative to said repeller electrode independently of the voltage of the extraction electrode relative to said repeller electrode for obtaining the mass spectrum of said gas in said ion source.
References Cited (Backward Citations)
US2499289A
Cited
US2772362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |