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Patent US3835319A successfully refreshed from Google Patents.
US3835319A
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US
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Cold cathode ion source mass spectrometer with straight line arrangement of ion source and analyzer
Assignee: National Research Corp
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Filing: 1971-05-14
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Granted: 1974-09-10
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Expires: 1991-05-14
Abstract
Abstract Mass spectrometer combination and ion source subcombination therefor. The mass spectrometer has a magnetron ion source, a quadrupole ion analyzer and an ion collector with digital counting read-out and this is useful for residual gas analysis, partial pressure analysis and chemical composition determination and is particularly suited for ultra-high vacuum usage yielding high sensitivity and improved signal-to-noise ratio, consistent with low weight and bulk. The ion source is constructed so that photons are not produced at those loci which can be viewed through the ion exit aperture thereof. Thus, the spectrometer collector is free from impingement thereon of light energy and the signal-to-noise ratio of the instrument is improved thereby.
Inventors
- 👤 J Roehrig
- 👤 F Torney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:10
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/10; H01J49/102
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A cold cathode ion discharge source comprising a cylindrical anode having open ends and a central longitudinal axis; first and second plate form discharge cathodes located at the respective ends of said anode, each said plate form cathode being substantially perpendicular to said axis, said second cathode having an ion exit aperture therethrough in coaxial alignment with said axis and in open communication with the space defined by said anode, said first cathode comprising a stub extending into the space defined by the cylindrical anode and in coaxial alignment with the longitudinal axis thereof, said stub having its terminus located short of the ion exit aperture of said second cathode, said terminus being open-ended and hollowed out to a depth sufficient to prevent glow discharge therefrom.
Claim 2
Dependent Claim
126 words
A cold cathode ion discharge source comprising a cylindrical anode having open ends and a central longitudinal axis; first and second plate form discharge cathodes located at the respective ends of said anode, each said plate form cathode being substantially perpendicular to said axis, said second cathode having an ion exit aperture therethrough in coaxial alignment with said axis and in open communication with the space defined by said anode, said first cathode comprising a stub extending into the space defined by the cylindrical anode and in coaxial alignment with the longitudinal axis thereof, said stub having its terminus located short of the ion exit aperture of said second cathode, said terminus being open-ended and hollowed out to a depth sufficient to prevent glow discharge therefrom.
Claim 3
Dependent Claim
30 words
The cold cathode ion source of claim 1 wherein the diameter of the terminus of said stub is equal to or greater than the diameter of said ion exit aperture.
Claim 4
Dependent Claim
23 words
The cold cathode ion source of claim 1 wherein said stub is of essentially solid construction and is dished inwardly at its terminus.
Claim 5
Dependent Claim
15 words
The cold cathode ion source of claim 1 wherein said stub is of tubular construction.
Claim 6
Dependent Claim
16 words
The cold cathode ion source of claim 1 wherein the terminus of said stub is flared.
Claim 7
Dependent Claim
30 words
The cold cathode ion source of claim 1 where the length of said stub is sufficient to locate the terminus thereof at about mid-way between said first and second cathodes.
Claim 8
Dependent Claim
183 words
A mass spectrometer comprising A. a cold cathode ion discharge source comprising a cylindrical anode having open ends and a central longitudinal axis; first and second plate form discharge cathodes located at the respective ends of said anode, each said plate form cathode being substantially perpendicular to said axis, said second cathode having an ion exit aperture therethrough in coaxial alignment with said axis and in open communication with the space defined by said anoDe, said first cathode comprising a stub extending into the space defined by the cylindrical anode and in coaxial alignment with the longitudinal axis thereof, said stub having its terminus located short of the ion exit aperture of said second cathode, said terminus being open-ended and hollowed out to a depth sufficient to prevent glow discharge therefrom, B. analyzer means located downstream from the ion exit aperture of (A) and in coaxial alignment with said longitudinal axis of said cylindrical anode, and C. ion collector means located downstream from said analyzer means and having an ion collector entry in coaxial alignment with said longitudinal axis of said cylindrical anode.
Claim 9
Dependent Claim
183 words
A mass spectrometer comprising A. a cold cathode ion discharge source comprising a cylindrical anode having open ends and a central longitudinal axis; first and second plate form discharge cathodes located at the respective ends of said anode, each said plate form cathode being substantially perpendicular to said axis, said second cathode having an ion exit aperture therethrough in coaxial alignment with said axis and in open communication with the space defined by said anoDe, said first cathode comprising a stub extending into the space defined by the cylindrical anode and in coaxial alignment with the longitudinal axis thereof, said stub having its terminus located short of the ion exit aperture of said second cathode, said terminus being open-ended and hollowed out to a depth sufficient to prevent glow discharge therefrom, B. analyzer means located downstream from the ion exit aperture of (A) and in coaxial alignment with said longitudinal axis of said cylindrical anode, and C. ion collector means located downstream from said analyzer means and having an ion collector entry in coaxial alignment with said longitudinal axis of said cylindrical anode.
Claim 10
Dependent Claim
17 words
The mass spectrometer of claim 7 wherein the analyzer means of (B) is of the quadrupole type.
Claim 11
Dependent Claim
14 words
The mass spectrometer of claim 7 wherein the terminus of said stub is flared.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |