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US4369404A
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Method and apparatus for the spectroscopic observation of particles
Assignee: University of Illinois Foundation
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Filing: 1980-09-15
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Granted: 1983-01-18
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Expires: 2000-09-15
Abstract
Abstract A method and apparatus for the spectroscopic observation of particles, such as molecules, transient molecules or atoms, molecular complexes, etc., including a Fabry-Perot cavity having a resonant frequency, a source of pulsed particles to be investigated, such as a pulsed supersonic nozzle beam applied to the cavity, while simultaneously applying a radiation pulse to the cavity sufficient to polarize the particles and provide a coherent radiation emission over a frequency band centered at the cavity resonant frequency, and observing the coherent emission frequencies which are characteristic of the respective particles within the pulsed particles applied to the cavity.
Inventors
- 👤 Willis H. Flygare
- 👤 Terrill J. Balle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:48
CPC Classifications
H; H01; H01S; H01S1/00; G; G01; G01N; G01N22/00; G01R; G01R23/00; G01R23/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A method of spectroscopic observation of particles, such as molecules, atoms or molecular complexes, said method comprising: providing a Fabry-Perot cavity having a cavity resonant frequency; applying a source of pulsed particles to be investigated to said Fabry-Perot cavity, while; simultaneously applying a radiation pulse to the pulsed particles in said Fabry-Perot cavity sufficient to polarize said particles and provide coherent radiation emission frequencies from said polarization over a frequency band centered at said cavity resonant frequency; said coherent radiation emission frequencies characteristic of the respective particles within said source of pulsed particles applied to the Fabry-Perot cavity; and observing said coherent radiation emission frequencies so as to determine said respective particle characteristics.
Claim 2
Independent Claim
113 words
A method of spectroscopic observation of particles, such as molecules, atoms or molecular complexes, said method comprising: providing a Fabry-Perot cavity having a cavity resonant frequency; applying a source of pulsed particles to be investigated to said Fabry-Perot cavity, while; simultaneously applying a radiation pulse to the pulsed particles in said Fabry-Perot cavity sufficient to polarize said particles and provide coherent radiation emission frequencies from said polarization over a frequency band centered at said cavity resonant frequency; said coherent radiation emission frequencies characteristic of the respective particles within said source of pulsed particles applied to the Fabry-Perot cavity; and observing said coherent radiation emission frequencies so as to determine said respective particle characteristics.
Claim 3
Dependent Claim
33 words
The method of claim 1, wherein said observing of said coherent radiation emission frequencies is initiated after a predetermined delay time interval following the application of said radiation pulse to the pulsed particles.
Claim 4
Dependent Claim
25 words
The method of claim 2, wherein said predetermined delay time interval corresponds sustantially to a time interval greater than the duration of said radiation pulse.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein said observing of said coherent radiation emission frequencies includes the step of performing a Fourier transform.
Claim 6
Dependent Claim
18 words
The method of claim 1, including the step of impedance matching said radiation pulse to the Fabry-Perot cavity.
Claim 7
Dependent Claim
122 words
Apparatus for the spectroscopic observation of particles, such as molecules, atoms or molecular complexes, said apparatus comprising: a Fabry-Perot cavity having a cavity resonant frequency; a source of pulsed particles to be investigated; means for supplying a radiation pulse; means for simultaneously applying said pulsed particles, and said radiation pulse to said Fabry-Perot cavity sufficient to polarize said particles and provide coherent radiation emission frequencies from said polarization over a frequency band centered at said cavity resonant frequency; said coherent radiation emission frequencies characteristic of the respective particles within said source of pulsed particles applied to the Fabry-Perot cavity; and detecting means coupled to said Fabry-Perot cavity for detecting said coherent radiation emission frequencies so as to determine said respective particle characteristics.
Claim 8
Dependent Claim
122 words
Apparatus for the spectroscopic observation of particles, such as molecules, atoms or molecular complexes, said apparatus comprising: a Fabry-Perot cavity having a cavity resonant frequency; a source of pulsed particles to be investigated; means for supplying a radiation pulse; means for simultaneously applying said pulsed particles, and said radiation pulse to said Fabry-Perot cavity sufficient to polarize said particles and provide coherent radiation emission frequencies from said polarization over a frequency band centered at said cavity resonant frequency; said coherent radiation emission frequencies characteristic of the respective particles within said source of pulsed particles applied to the Fabry-Perot cavity; and detecting means coupled to said Fabry-Perot cavity for detecting said coherent radiation emission frequencies so as to determine said respective particle characteristics.
Claim 9
Dependent Claim
33 words
Apparatus according to claim 6, including means for delaying the detection of said coherent radiation emission frequencies for a predetermined time interval following the application of said radiation pulse to said Fabry-Perot cavity.
Claim 10
Dependent Claim
21 words
Apparatus according to claim 7, wherein said predetermined time interval corresponds substantially to a time interval greater than said radiation pulse.
Claim 11
Dependent Claim
19 words
Apparatus according to claim 6, including means for performing a Fourier transform on said detected coherent radiation emission frequencies.
Claim 12
Dependent Claim
17 words
Apparatus according to claim 6, including means for impedance matching said radiation pulse to said Fabry-Perot cavity.
Claim 13
Dependent Claim
48 words
Apparatus according to claim 6, including a microwave frequency source supplying said radiation pulse, and pulse sequencing means coupled to said microwave frequency source and to said source of pulsed particles for sequencing the simultaneous application of said radiation pulse and said pulsed particles to said Fabry-Perot cavity.
Claim 14
Dependent Claim
81 words
Apparatus according to claim 11, including first switch means coupled intermediate said microwave frequency source and said Fabry-Perot cavity and second switch means coupled intermediate said Fabry-Perot cavity and said detecting means, said first and second switch means operable by said pulse sequencing means to sequentially enable the application of said radiation pulse to said Fabry-Perot cavity, and the coupling of said detecting means to said Fabry-Perot Cavity with respect to the application of said pulsed particles to said Fabry-Perot cavity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |