US3787692A
Expired / Lapsed
US
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Induced electron emission spectrometer using plural radiation sources
Assignee: Varian Medical Systems Inc
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Filing: 1971-05-17
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Granted: 1974-01-22
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Expires: 1991-05-17
Abstract
Abstract An induced electron emission spectrometer wherein different sources are employed to irradiate the sample from different energy sources to permit the operator to distinguish the photoelectron emission lines from the Auger electron emission lines. In one embodiment, the X-ray source employs two different X-ray energy emitting materials with means for selectively energizing one or the other of said materials to irradiate the sample under investigation with selective X-ray energies. In another embodiment the sample is first irradiated with X-rays and thereafter irradiated with electrons. In another embodiment, an X-ray source and then an ultraviolet radiation source are used.
Inventors
- 👤 W Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/44; H01J49/46; H01J49/48; H01J49/484
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
In an induced electron emission spectrometer wherein cathode means are provided for producing electrons and anode means are bombarded by said electrons to produce X-rays for irradiating a sample to be analyzed, said sample emitting charged particles, a charged particle detector, and energy selecting means for directing charged particles of selected energy onto said charged particle detector, the improvement comprising anode means comprising at least two different X-ray irradiating materials and cathode means for selectively bombarding one or the other of said irradiating materials.
Claim 2
Dependent Claim
84 words
In an induced electron emission spectrometer wherein cathode means are provided for producing electrons and anode means are bombarded by said electrons to produce X-rays for irradiating a sample to be analyzed, said sample emitting charged particles, a charged particle detector, and energy selecting means for directing charged particles of selected energy onto said charged particle detector, the improvement comprising anode means comprising at least two different X-ray irradiating materials and cathode means for selectively bombarding one or the other of said irradiating materials.
Claim 3
Dependent Claim
16 words
The spectrometer of claim 1 wherein said two different X-ray irradiating materials are aluminum and magnesium.
Claim 4
Dependent Claim
30 words
The spectrometer of claim 1 wherein said anode comprises at least two sections and wherein said cathode means comprises a portion for each anode section, the portion being independently energizable.
Claim 5
Dependent Claim
16 words
The spectrometer of claim 3 wherein said two different x-ray irradiating materials are aluminum and magnesium.
Claim 6
Dependent Claim
42 words
The spectrometer of claim 3 wherein said anode is annular shaped, with each section in the form of a half-circle, and wherein said cathode is in two half-circle sections, one for each anode section, and means for energizing said cathode sections independently.
Claim 7
Dependent Claim
16 words
The spectrometer of claim 5 wherein said two different X-ray irradiating materials are aluminum and magnesium.
Claim 8
Dependent Claim
35 words
The spectrometer of claim 1 wherein said anode comprises at least two sections and wherein means are provided for selectively directing the electrons from said cathode onto one or the other of said anode sections.
Claim 9
Dependent Claim
16 words
The spectromter of claim 7 wherein said two different X-ray irradiating materials are aluminum and magnesium.
Claim 10
Dependent Claim
45 words
The spectrometer of claim 7 wherein said anode sections are concentric annular anodes and wherein said cathode is annular shaped and concentric with said two anode sections, said latter means selectively directing electrons from the cathode onto one or the other of said anode sections.
Claim 11
Dependent Claim
16 words
The spectrometer of claim 9 wherein said two different X-ray irradiating materials are aluminum and magnesium.
Claim 12
Dependent Claim
159 words
In an induced electron emission spectrometer wherein a sample under analysis emits electrons upon being irradiated with X-ray radiation, means for selectively bombarding with electrons a first target to produce X-rays having a first energy and a second target to produce X-rays having a second energy, said second energy being different from said first energy, means for irradiating said sample with said X-rays of said first energy to produce a first induced electron emission spectrum from said sample and means for irradiating said sample with X-rays of said second energy to produce a second induced electron emission spectrum from said sample, detector means for detecting said eLectrons emitted from said sample, and energy selecting means for directing emitted electrons of selected energies onto said detector means, THE IMPROVEMENT WHEREIN said means for selectively bombarding with electrons said first and second targets comprises a focusing electrode whereby said bombarding electrons can be selectively focused to bombard either of said targets.
Claim 13
Dependent Claim
159 words
In an induced electron emission spectrometer wherein a sample under analysis emits electrons upon being irradiated with X-ray radiation, means for selectively bombarding with electrons a first target to produce X-rays having a first energy and a second target to produce X-rays having a second energy, said second energy being different from said first energy, means for irradiating said sample with said X-rays of said first energy to produce a first induced electron emission spectrum from said sample and means for irradiating said sample with X-rays of said second energy to produce a second induced electron emission spectrum from said sample, detector means for detecting said eLectrons emitted from said sample, and energy selecting means for directing emitted electrons of selected energies onto said detector means, THE IMPROVEMENT WHEREIN said means for selectively bombarding with electrons said first and second targets comprises a focusing electrode whereby said bombarding electrons can be selectively focused to bombard either of said targets.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |