Radiant energy – Ion generation – Field ionization type
Patent
1977-11-14
1979-10-09
Dixon, Harold A.
Radiant energy
Ion generation
Field ionization type
250281, 250423R, H01J 2700
Patent
active
041707362
ABSTRACT:
An arrangement for detecting low concentrations of molecular gases. A gaseous sample containing molecules of the gas to be detected is simultaneously subjected to two photon beams which, for example, may be generated by lasers. The wave length of the first photon beam corresponds to the energy separation between the ground electronic state and an excited electronic state of the molecular gas and the second photon beam contains energy in a wave length corresponding to the energy separation between the excited electronic state and the ionization limit of the molecule. Detection of the amount of ionization achieved is a measure of the concentration of the molecular gas in the sample. Simultaneous identification of the particular wave lengths causing the transition of the molecules from the ground energy state to the excited state provides an additional parameter identifying the molecules.
REFERENCES:
patent: 3558877 (1971-01-01), Pressman
patent: 3937956 (1976-02-01), Lyon
patent: 4000420 (1976-12-01), Harris
patent: 4023038 (1977-05-01), Janes et al.
"Selective Two-Step"--by Laser Radiation by Ambartzumian et al., Applied Optics, vol. 11, No. 2, Feb. 1972, pp. 354-358.
Dixon Harold A.
Finkelstein Don B.
The Aerospace Corporation
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