US3987302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonance ionization for analytical spectroscopy
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-08-27
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Granted: 1976-10-19
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Expires: 1995-08-27
Abstract
Abstract This invention relates to a method for the sensitive and selective analysis of an atomic or molecular component of a gas. According to this method, the desired neutral component is ionized by one or more resonance photon absorptions, and the resultant ions are measured in a sensitive counter. Numerous energy pathways are described for accomplishing the ionization including the use of one or two tunable pulsed dye lasers.
Inventors
- 👤 George S. Hurst
- 👤 Marvin G. Payne
- 👤 Edward B. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:37
CPC Classifications
G; G01; G01N; G01N24/00; G01N24/006; B; B01; B01D; B01D59/00; B01D59/34; G01N27/00; G01N27/62; G01N27/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A method for the sensitive and selective analysis of an atomic or molecular component of a gas in an ion measuring chamber, comprising the steps of exciting said component to a first excited state, further exciting said component to a second and higher energy excited state from said first state through resonance photon absorption, said second excited state being at an energy level greater than one-half the energy between said first excited state and the ionization potential of said component, ionizing said component from said second excited state, and measuring the ions produced by the ionization within said chamber.
Claim 2
Independent Claim
99 words
A method for the sensitive and selective analysis of an atomic or molecular component of a gas in an ion measuring chamber, comprising the steps of exciting said component to a first excited state, further exciting said component to a second and higher energy excited state from said first state through resonance photon absorption, said second excited state being at an energy level greater than one-half the energy between said first excited state and the ionization potential of said component, ionizing said component from said second excited state, and measuring the ions produced by the ionization within said chamber.
Claim 3
Dependent Claim
21 words
The method set forth in claim 1, wherein said resonance photon absorption is effected by a first tuned pulsed dye laser.
Claim 4
Dependent Claim
26 words
The method set forth in claim 1 wherein said first excited state is produced by resonance photon absorption effected by a second tuned pulsed dye laser.
Claim 5
Dependent Claim
17 words
The method set forth in claim 1 wherein said first excited state is produced by energetic electrons.
Claim 6
Dependent Claim
20 words
The method set forth in claim 1 wherein said ionization of said second excited state is effected by photo absorption.
Claim 7
Dependent Claim
19 words
The method set forth in claim 1 wherein said ionization of said second excited state is effected by chemi-ionization.
Claim 8
Dependent Claim
20 words
The method set forth in claim 1 wherein said ionization of said second excited state is effected by associative ionization.
Claim 9
Dependent Claim
41 words
The method set forth in claim 1 wherein said second excited state is at an energy very near the ionization potential, and said ionization of said second excited state is effected by the application of an electric field within said chamber.
Claim 10
Dependent Claim
20 words
The method set forth in claim 1 wherein said ionization of said second excited state is effected by Penning ionization.
Claim 11
Dependent Claim
33 words
The method set forth in claim 1 wherein all of said second excited state is ionized whereby the measured ionization is an accurate measure of the concentration of said component in said gas.
References Cited (Backward Citations)
US2950389A
Cited
US3772519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |