US3986024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for electrical detection of ions for mass-spectroscopic determination of the mass-magnitudes and mass-intensities of ions
Assignee: Forschungszentrum Jülich
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Filing: 1975-12-15
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Granted: 1976-10-12
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Expires: 1995-12-15
Abstract
Abstract An arrangement for the electrical detection of ions for mass spectroscopicetermination of the mass values and of the mass intensities, in which a channel multiplier plate has a number of electron multipliers of minimum dimension, and is located behind the exit gap of the magnet of the mass spectroscopic device for capturing ions focused in the focal plane of the spectroscopic device. The electrons emanating from the channel multiplier plate and emitted off by ions of different mass in the electron multipliers, are captured and the signals generated by the collected electrons are transmitted to a recorder. Wires located behind and along the channel multiplier plate, capture the electrons and transmit the signals generated by the electrons, to the recorder. The wires are perpendicular to the direction of the electron multipliers, and perpendicular to the lengthwise direction of the exit gap. The wires are isolated from each other and do not contact one another. The wires have surfaces facing the channel multiplier plate to serve as collecting surfaces for the electrons. An amplifier is connected to each wire for amplifying the current pulses generated by the electrons in the wires.
Inventors
- 👤 Leonhard Radermacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:35
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
225 words
An arrangement for electrical detection of ions for mass spectroscopic determination of the mass values and of the mass intensities of ions, comprising in combination, a channel multiplier plate having a number of electron multipliers of minimum dimension; mass spectroscopic means with magnet means and exit gap means, said channel multiplier plate being located behind said exit gap means of said magnet means for receiving ions focused in the focal plane of said mass spectroscopic means; means for receiving electrons emanating from said channel multiplier plate and emitted off by ions of different mass in said electron multipliers of said channel multiplier plate; recording means connected to said means for receiving electrons emanating from said channel multiplier plate, said receiving means transmitting signals generated by the received electrons to said recording means; said means for receiving the electrons and transmitting the signals generated by the electrons comprising wires located behind and along the channel multiplier plate and perpendicular to the direction of the electron multipliers and perpendicular to the lengthwise direction of said exit gap means, said wires being isolated from each other and free from contact with each other, said wires having surfaces facing the channel multiplier plate and comprising receiving surface for the electrons; and amplifier means connected to each wire for amplifying the current pulses generated in the wires by the electrons.
Claim 2
Dependent Claim
225 words
An arrangement for electrical detection of ions for mass spectroscopic determination of the mass values and of the mass intensities of ions, comprising in combination, a channel multiplier plate having a number of electron multipliers of minimum dimension; mass spectroscopic means with magnet means and exit gap means, said channel multiplier plate being located behind said exit gap means of said magnet means for receiving ions focused in the focal plane of said mass spectroscopic means; means for receiving electrons emanating from said channel multiplier plate and emitted off by ions of different mass in said electron multipliers of said channel multiplier plate; recording means connected to said means for receiving electrons emanating from said channel multiplier plate, said receiving means transmitting signals generated by the received electrons to said recording means; said means for receiving the electrons and transmitting the signals generated by the electrons comprising wires located behind and along the channel multiplier plate and perpendicular to the direction of the electron multipliers and perpendicular to the lengthwise direction of said exit gap means, said wires being isolated from each other and free from contact with each other, said wires having surfaces facing the channel multiplier plate and comprising receiving surface for the electrons; and amplifier means connected to each wire for amplifying the current pulses generated in the wires by the electrons.
Claim 3
Dependent Claim
112 words
The arrangement as defined in claim 1 wherein the spacings between said wires located behind said channel multiplier plate are defined further by the relation ##EQU7## where A n are the distances between the wires n is a running index for designating various spacings U is the accelerating potential of said mass spectroscopic means ΔU is an assumed constant rate of change of the accelerating potential r n is the deflection radius of the ion trajectories, changed due to the change of accelerating potential U, in the magnet of said mass spectroscopic means; and f is a proportionality factor for converting the deflection radius changed into path lengths in the focal plane.
Claim 4
Dependent Claim
126 words
The arrangement as defined in claim 1 wherein said electron multipliers of said channel multiplier plate are aligned perpendicular to the lengthwise direction of said exit gap means and perpendicular to the direction of incidence of the ions in the lengthwise direction of the gap, said electron multipliers being displaced laterally from the center of said exit gap means, means for collecting ions in the focal plane and converting them to electrons behind said exit gap means, said means for collecting ions having a stray magnetic field, and an electrical potential field located parallel to the direction of said stray magnetic field between said means for converting ions and said channel multiplier plate, said electrical potential field drawing off the electrons towards said channel multiplier plate.
Claim 5
Dependent Claim
83 words
The arrangement as defined in claim 2 wherein the accelerating potential of said mass spectroscopic means is varied in steps in such a way that for ions of the same mass the distance between two wires being equal to the sum of the spacings obtained by the stepwise change of the accelerating potential between the impact points of the ions in the focal plane, said impact points lying in a collecting area in the focal plane, said area being between two adjacent wires.
Claim 6
Dependent Claim
126 words
The arrangement as defined in claim 2 wherein said electron multipliers of said channel multiplier plate are aligned perpendicular to the lengthwise direction of said exit gap means and perpendicular to the direction of incidence of the ions in the lengthwise direction of the gap, said electron multipliers being displaced laterally from the center of said exit gap means, means for collecting ions in the focal plane and converting them to electrons behind said exit gap means, said means for collecting ions having a stray magnetic field, and an electrical potential field located parallel to the direction of said stray magnetic field between said means for converting ions and said channel multiplier plate, said electrical potential field drawing off the electrons towards said channel multiplier plate.
Claim 7
Dependent Claim
83 words
The arrangement as defined in claim 3 wherein the accelerating potential of said mass spectroscopic means is varied in steps in such a way that for ions of the same mass the distance between two wires being equal to the sum of the spacings obtained by the stepwise change of the accelerating potential between the impact points of the ions in the focal plane, said impact points lying in a collecting area in the focal plane, said area being between two adjacent wires.
Claim 8
Dependent Claim
83 words
The arrangement as defined in claim 5 wherein the accelerating potential of said mass spectroscopic means is varied in steps in such a way that for ions of the same mass the distance between two wires being equal to the sum of the spacings obtained by the stepwise change of the accelerating potential between the impact points of the ions in the focal plane, said impact points lying in a collecting area in the focal plane, said area being between two adjacent wires.
References Cited (Backward Citations)
US3691382A
Cited
US3946227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |