US3555271A
Expired / Lapsed
US
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Radio frequency mass analyzer of the nonuniform electric field type
Assignee: Bell and Howell Co
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Filing: 1967-11-06
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Granted: 1971-01-12
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Expires: 1987-11-06
Abstract
Abstract Radio frequency mass analyzers of the nonuniform electric field type and a charged particle source for use therewith. The source provides means for ionizing particles and means for imparting energy pulses to charged particles emanating from the source. A drift tube is interposed between the source and analyzer in some embodiments to allow the pulsed particles to separate into discrete groups in space. The length of the drift tube and the frequency of the impulser are arranged such that charged particles of a predetermined mass are admitted to the mass analyzer during a specific phase angle of the AC voltage connected to the electrodes of the mass analyzer.
Inventors
- 👤 Wilson M Brubaker
- 👤 Charles F Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/06; H01J49/067; H01J49/26; H01J49/34; H01J49/36
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
164 words
A mass analyzer comprising: a first elongated electrode; a second elongated electrode disposed in a parallel and substantially coextensive relation with respect to said first electrode, said first and second electrodes defining an entrance end and an exit end of the analyzer; a source of alternating voltage; a source of static voltage; means for connecting the voltage sources to the electrodes to create a combined alternating and static analyzing electric field therebetween; a source of charged particles located adjacent the entrance end of the two electrodes arranged to direct particles along a path generally parallel to the electrodes; restricting means located between the source and the entrance end of the electrodes for limiting the transmission of charged particles past the entrance end of the electrodes to a predetermined phase angle of the alternating voltage connected to the electrodes of the analyzer; and means for detecting the particles transmitted by the analyzer located at the exit end of the electrodes opposite the charged particle source.
Claim 2
Dependent Claim
164 words
A mass analyzer comprising: a first elongated electrode; a second elongated electrode disposed in a parallel and substantially coextensive relation with respect to said first electrode, said first and second electrodes defining an entrance end and an exit end of the analyzer; a source of alternating voltage; a source of static voltage; means for connecting the voltage sources to the electrodes to create a combined alternating and static analyzing electric field therebetween; a source of charged particles located adjacent the entrance end of the two electrodes arranged to direct particles along a path generally parallel to the electrodes; restricting means located between the source and the entrance end of the electrodes for limiting the transmission of charged particles past the entrance end of the electrodes to a predetermined phase angle of the alternating voltage connected to the electrodes of the analyzer; and means for detecting the particles transmitted by the analyzer located at the exit end of the electrodes opposite the charged particle source.
Claim 3
Dependent Claim
35 words
A charged particle source according to claim 1 wherein the restricting means includes means for pulsing charged particles from the source to cause said particles to approach the entrance end of the electrodes in bunches.
Claim 4
Dependent Claim
11 words
directing the charged particles toward the entrance end of the analyzeR;
Claim 5
Dependent Claim
11 words
directing the charged particles toward the entrance end of the analyzeR;
Claim 6
Dependent Claim
27 words
allowing the charged particles created by the source to pass a first predetermined point located between the source and the entrance end in a time 1/3 t;
Claim 7
Dependent Claim
27 words
allowing the charged particles created by the source to pass a first predetermined point located between the source and the entrance end in a time 1/3 t;
Claim 8
Dependent Claim
15 words
A mass analyzer according to claim 2 wherein the restricting means includes a drift tube.
Claim 9
Dependent Claim
31 words
A mass analyzer according to claim 2 wherein the alternating voltage is defined by the relation V VA sin omega t and the predetermined phase angle is approximately 90* and 270*.
Claim 10
Dependent Claim
86 words
causing the particles to accelerate through a distance, d, such that the particles bunch together in a pulse and pass a second predetermined point located between said first point and the entrance end in a time interval substantially smaller than 1/3 t; 5 restricting the transmission of the charged particles into the entrance end of the analyzer to a phase angle of approximately 90* and 270* of an alternating voltage defined by the relation V VA sin omega t applied to the electrodes of the analyzer;
Claim 11
Dependent Claim
86 words
causing the particles to accelerate through a distance, d, such that the particles bunch together in a pulse and pass a second predetermined point located between said first point and the entrance end in a time interval substantially smaller than 1/3 t; 5 restricting the transmission of the charged particles into the entrance end of the analyzer to a phase angle of approximately 90* and 270* of an alternating voltage defined by the relation V VA sin omega t applied to the electrodes of the analyzer;
Claim 12
Dependent Claim
42 words
A mass analyzer according to claim 1 wherein the first electrode is an elongated rod electrode and the second electrode is a right angle electrode laterally spaced and extending longitudinally of the first electrode, the two electrodes defining a monopole mass analyzer.
Claim 13
Dependent Claim
66 words
A mass analyzer according to claim 1 wherein the first electrode is an elongated rod, the second electrode is an elongated rod and including a third electrode comprising a flat plate laterally spaced and extending longitudinally of the first and second electrode in a parallel relationship with a plane passing through the first and second electrodes such that the three electrodes define a duopole mass analyzer.
Claim 14
Dependent Claim
21 words
transmitting particles of a predetermined mass through the analyzer by means of the discriminating effect of the analyzer electric field; and
Claim 15
Dependent Claim
21 words
transmitting particles of a predetermined mass through the analyzer by means of the discriminating effect of the analyzer electric field; and
Claim 16
Dependent Claim
18 words
collecting the particles transmitted through the analyzer subsequent to their emergence from the exit end of the analyzer.
Claim 17
Dependent Claim
18 words
collecting the particles transmitted through the analyzer subsequent to their emergence from the exit end of the analyzer.
Claim 18
Dependent Claim
68 words
A mass analyzer according to claim 1 wherein the first electrode is an elongated rod, the second electrode is an elongated rod and including two additional elongated rod electrodes laterally spaced from and extending longitudinally of the first and second electrodes, the four electrodes being symmetrically disposed about and laterally spaced from a central axis, the combination of the four electrodes defining an analyzer of the quadrupole type.
Claim 19
Dependent Claim
65 words
A mass analyzer according to claim 1 wherein the first electrode is an elongated cylinder having a first radius and the second electrode is an elongated cylinder having a second smaller radius, the second electrode being located interiorly of and concentrically disposed with the first electrode such that the two electrodes define a coaxial mass analyzer having an analyzing field created between the two electrodes.
Claim 20
Dependent Claim
127 words
A mass analyzer comprising: a first elongated electrode; a second elongated electrode disposed in a parallel and substantially coextensive relation with respect to said first electrode, said first and second electrodes defining an entrance end and an exit end to the analyzer; a source of alternating voltage; a source of static voltage; means for connecting the voltage sources to the electrodes to create a combined alternating and static electric field therebetween; a source of ions located at a point removed from the entrance end of the two electrodes; means for pulsing the ions produced by the source toward the entrance end of the electrodes; and means for detecting the ions transmitted by the analyzer located at the exit end of the electrodes opposite the charged particle source.
Claim 21
Dependent Claim
127 words
A mass analyzer comprising: a first elongated electrode; a second elongated electrode disposed in a parallel and substantially coextensive relation with respect to said first electrode, said first and second electrodes defining an entrance end and an exit end to the analyzer; a source of alternating voltage; a source of static voltage; means for connecting the voltage sources to the electrodes to create a combined alternating and static electric field therebetween; a source of ions located at a point removed from the entrance end of the two electrodes; means for pulsing the ions produced by the source toward the entrance end of the electrodes; and means for detecting the ions transmitted by the analyzer located at the exit end of the electrodes opposite the charged particle source.
Claim 22
Dependent Claim
15 words
A mass analyzer according to claim 9 wherein the pulsing means is a klystron device.
Claim 23
Dependent Claim
98 words
In a radio frequency mass analyzer of the nonuniform electric field type, the improvement comprising: a source of ions located externally of the analyzing region of the analyzer; grid means located in the ion source in the path of ion travel; an electric pulse generator connected to the grid means; and a drift tube interposed between the grid means and the exit end of the source whereby the ions from the source are bunched and the exit of ions therefrom is restricted to a predetermined phase angle of an alternating voltage applied to the electrodes of the analyzer.
Claim 24
Dependent Claim
98 words
In a radio frequency mass analyzer of the nonuniform electric field type, the improvement comprising: a source of ions located externally of the analyzing region of the analyzer; grid means located in the ion source in the path of ion travel; an electric pulse generator connected to the grid means; and a drift tube interposed between the grid means and the exit end of the source whereby the ions from the source are bunched and the exit of ions therefrom is restricted to a predetermined phase angle of an alternating voltage applied to the electrodes of the analyzer.
Claim 25
Dependent Claim
31 words
An ion source according to claim 11 wherein the alternating voltage is defined by the relation V VA sin omega t and the predetermined phase angle is approximately 90* and 270*.
Claim 26
Independent Claim
19 words
A method of operating a radio frequency mass analyzer of the nonuniform electric field type including the steps of:
Claim 27
Independent Claim
19 words
A method of operating a radio frequency mass analyzer of the nonuniform electric field type including the steps of:
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |