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US3673404A
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Ion kinetic energy analysis
Assignee: Applied Biosystems Inc
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Filing: 1970-05-15
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Granted: 1972-06-27
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Expires: 1990-05-15
Abstract
Abstract A method of ion kinetic energy analysis is provided by forming ions including metastable ions from a vaporized sample material, accelerating the ions toward a target collector electrode through an electric field, and for an interval of time for enhancing the probability of decomposition of the metastable ions in an area along a trajectory of the ions intermediate the ion source and the electric field, varying the electric field intensity for causing daughter ions of differing kinetic energy to be successively focused at a point along the trajectory and providing a spectrum display of the intensity of the ions formed at the point in synchronism with the field variation.
Inventors
- 👤 Harold W Major Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:21
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/28; H01J49/32; H01J49/324
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A method of metastable ion kinetic energy and mass analysis comprising the steps of: forming a plurality of ions including metastable ions from a vaporized sample material; projecting said ions toward a deflection electric field for a transit time period prior to entry into said deflection electric field that is greater than 1 microsecond to increase the probability of creation of daughter ions from said meTastable ions and successively projecting said ions toward a magnetic field; varying the deflection electric field intensity while maintaining the magnetic field intensity at a constant value for focusing daughter ions resulting from a metastable decomposition at a first collector electrode; displaying a kinetic energy spectrum of abundance of daughter ions at said first collector electrode in synchronism with electric field intensity variations, said spectrum including at least one peak; establishing the deflection electric field intensity at a constant value corresponding to a peak in the kinetic energy spectrum; varying the magnetic field intensity for causing ions of differing masses to be successively focused at a second collector electrode; and providing a mass spectrum display for the variation in magnetic field intensity corresponding to the selected value of electric field intensity.
Claim 2
Independent Claim
196 words
A method of metastable ion kinetic energy and mass analysis comprising the steps of: forming a plurality of ions including metastable ions from a vaporized sample material; projecting said ions toward a deflection electric field for a transit time period prior to entry into said deflection electric field that is greater than 1 microsecond to increase the probability of creation of daughter ions from said meTastable ions and successively projecting said ions toward a magnetic field; varying the deflection electric field intensity while maintaining the magnetic field intensity at a constant value for focusing daughter ions resulting from a metastable decomposition at a first collector electrode; displaying a kinetic energy spectrum of abundance of daughter ions at said first collector electrode in synchronism with electric field intensity variations, said spectrum including at least one peak; establishing the deflection electric field intensity at a constant value corresponding to a peak in the kinetic energy spectrum; varying the magnetic field intensity for causing ions of differing masses to be successively focused at a second collector electrode; and providing a mass spectrum display for the variation in magnetic field intensity corresponding to the selected value of electric field intensity.
References Cited (Backward Citations)
GB1149426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |