US4613755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of mass spectrometry
Assignee: United States Department of the Navy
•
Filing: 1983-06-20
•
Granted: 1986-09-23
•
Expires: 2003-06-20
Abstract
Abstract Ions of a particular gas in a mixture of gases are made for mass spectrometry purposes by selectively electronically exciting the target gas and allowing the excited target gas to undergo a charge-exchange reaction with a reagent ion.
Inventors
- 👤 Jeffrey W. Hudgens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:21
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/14; H; H01; H01J; H01J49/00; H01J49/02; H01J49/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
99 words
A method of producing ions of a target gas, BC, in a mixture of gases, the steps of which comprise: selecting a reagent ion X + so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-exchange reaction: X.sup.+ +BC*→X+BC.sup.+.
Claim 2
Independent Claim
99 words
A method of producing ions of a target gas, BC, in a mixture of gases, the steps of which comprise: selecting a reagent ion X + so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-exchange reaction: X.sup.+ +BC*→X+BC.sup.+.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of light having a wavelength of about 900 to 120 nm.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said inducing step comprises the step of laser-inducing said electronic transition of BC to said excited state.
Claim 5
Dependent Claim
34 words
The method of claim 2 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of a incandescent lamp equipped with an appropriate filter.
Claim 6
Dependent Claim
34 words
The method of claim 2 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of a fluorescent light equipped with an appropriate filter.
Claim 7
Dependent Claim
34 words
The method of claim 2 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of an arc lamp equipped with an appropriate filter.
Claim 8
Independent Claim
112 words
A method of producing ions of a target gas, BC, in a mixture of gases for mass-spectroscopic analysis, the steps of which comprise: selecting a reagent ion, X + , from the group consisting of cesium and sodium cations so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-transfer reaction: X.sup.+ +BC*→X+BC.sup.+.
Claim 9
Independent Claim
112 words
A method of producing ions of a target gas, BC, in a mixture of gases for mass-spectroscopic analysis, the steps of which comprise: selecting a reagent ion, X + , from the group consisting of cesium and sodium cations so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-transfer reaction: X.sup.+ +BC*→X+BC.sup.+.
Claim 10
Independent Claim
105 words
A method of spectroscopically analysing a target gas, BC, in a mixture of gases, the steps of which comprise: selecting a reagent ion, X + , so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-transfer reaction: X.sup.+ +BC*→X+BC.sup.+ ; mass-spectroscopically analysing BC + .
Claim 11
Independent Claim
105 words
A method of spectroscopically analysing a target gas, BC, in a mixture of gases, the steps of which comprise: selecting a reagent ion, X + , so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-transfer reaction: X.sup.+ +BC*→X+BC.sup.+ ; mass-spectroscopically analysing BC + .
Claim 12
Dependent Claim
36 words
The method of claim 8 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of light having a wavelength of about 900 to 120 nm.
Claim 13
Dependent Claim
23 words
The method of claim 9 wherein said inducing step comprises the step of laser-inducing said electronic transition of BC to said excited state.
Claim 14
Dependent Claim
34 words
The method of claim 9 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of a incandescent lamp equipped with an appropriate filter.
Claim 15
Dependent Claim
34 words
The method of claim 9 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of a fluorescent light equipped with an appropriate filter.
Claim 16
Dependent Claim
34 words
The method of claim 9 wherein said inducing step comprises the step of inducing said electronic transition of BC to said excited state by means of an arc lamp equipped with an appropriate filter.
Claim 17
Independent Claim
114 words
A method of spectroscopically analysing a target gas, BC, in a mixture of gases, the steps of which comprise: selecting a reagent ion, X + , from the group consisting of cesium and sodium cations so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-transfer reaction: X.sup.+ +BC*→X+BC.sup.+ ; mass-spectroscopically analysing BC + .
Claim 18
Independent Claim
114 words
A method of spectroscopically analysing a target gas, BC, in a mixture of gases, the steps of which comprise: selecting a reagent ion, X + , from the group consisting of cesium and sodium cations so that the electron affinity of X + is less than the ionization potential of any of the gases in said mixture, including BC; selectively inducing an electronic transition of BC to an excited electronic state to produce BC* so that the ionization potential of BC* is less than the electron affinity of X + ; colliding X + with BC* to produce BC + in accordance with the charge-transfer reaction: X.sup.+ +BC*→X+BC.sup.+ ; mass-spectroscopically analysing BC + .
References Cited (Backward Citations)
US3521054A
Cited
US3740552A
Cited
US3974390A
Cited
US4000420A
Cited
US4044252A
Cited
US4176025A
Cited
US4085332A
Cited
US4140905A
Cited
US4206350A
Cited
US4502676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |