Chemistry: analytical and immunological testing – Oxygen containing – Molecular oxygen
Patent
1995-02-23
1997-09-23
Warden, Jill
Chemistry: analytical and immunological testing
Oxygen containing
Molecular oxygen
436116, 436134, 436138, 436173, 250282, 250288, G01N 2300
Patent
active
056703783
ABSTRACT:
Trace levels of molecular oxygen are measured by introducing a gas containing the molecular oxygen into a target zone, and impacting the molecular oxygen in the target zone with electrons at the O.sup.- resonant energy level for dissociative electron attachment to produce O.sup.- ions. Preferably, the electrons have an energy of about 4 to about 10 eV. The amount of O.sup.- ions produced is measured, and is correlated with the molecular oxygen content in the target zone. The technique is effective for measuring levels of oxygen below 50 ppb, and even less than 1 ppb. The amount of O.sup.- can be measure in a quadrupole mass analyzer. Best results are obtained when the electrons have an energy of about 6 to about 8 eV, and preferably about 6.8 eV. The method can be used for other species by selecting the appropriate electron energy level.
REFERENCES:
patent: 2761975 (1956-09-01), Weisz
patent: 3621240 (1971-11-01), Cohen
patent: 3742213 (1973-06-01), Cohen et al.
patent: 3866041 (1975-02-01), Attia
patent: 4158775 (1979-06-01), Chutjian et al.
patent: 4239967 (1980-12-01), Carr et al.
patent: 4261698 (1981-04-01), Carr et al.
patent: 4649273 (1987-03-01), Chutjian et al.
patent: 4649278 (1987-03-01), Chutjian et al.
patent: 4757198 (1988-07-01), Korte et al.
patent: 4771172 (1988-09-01), Weber-Grabau et al.
patent: 4855594 (1989-08-01), Kimock et al.
patent: 4902642 (1990-02-01), Chutjian et al.
patent: 4933551 (1990-06-01), Bernius et al.
patent: 4963735 (1990-10-01), Okamoto et al.
patent: 4975576 (1990-12-01), Federer et al.
patent: 5053343 (1991-10-01), Vora et al.
patent: 5097124 (1992-03-01), Devienne
patent: 5175431 (1992-12-01), Eisele et al.
patent: 5218203 (1993-06-01), Eisele et al.
patent: 5256874 (1993-10-01), Chutjian
patent: 5291017 (1994-03-01), Wang et al.
patent: 5300773 (1994-04-01), Davies
patent: 5304797 (1994-04-01), Irie et al.
patent: 5347828 (1994-09-01), Boumsellek et al.
patent: 5412207 (1995-05-01), Micco et al.
patent: 5432343 (1995-07-01), Gulcicek et al.
patent: 5442175 (1995-08-01), Dawson
Bernius et al. "Application of Reversed Electron Attachment for Ultrasensitive Detection of Thermal Electron-Attaching Molecules: CCl.sub.4 & C.sub.6 H.sub.5 NO.sub.2 " Anal. Chem. 1990, 62, 1345-1349.
Bernius et al. "Pulsed High Current in Line Reversal Electron Attachment Detector". J. Appl. Phys. 66(7) Oct. 1, 1989 pp. 2783-2788.
McLuckey et al "Atmospheric Sampling Glow Discharge Ionization Source for the Determination of Trace Organic Compounds in Ambient Air" Anal. Chem. 1988, 60, 2220-2227.
Boumsellek et al "Increased Response of the Reversal Electron Attachment Detector & Modeling of Ion Spaced-Charged Effects" Anal. Chem. 1992, 64, 2096-2100.
Krishnakumar et al. "Dissociative Attachment of Electrons to N.sub.2 O" Physical Review A, 41, 5, Mar. 1, 1990, 2445-2457.
P. K. Sharma, 4th Int. Conf. on Experimental Methods for Microgravity Materials Science Research, Kinetic Considerations in Oxide Monolayer Formation on Metals and Implication to Microgravity Experiments Dealing With Metallic Melts, Ed. R. A. Schiffman, A Publication of the Minerals Metals & Materials Society, Warrendale, Pennsylvania 127-132 (1992).
P. K. Sharma and P. K. Seshan, Activation of Copper Dispersed On A Zeolite For Oxygen Sorption, Chemically Modified Oxide Surfaces, vol. 3, Eds. D. E. Leyden and W. T. Collins, Gordon and Breach, New York, 65-80 (1990).
P. K. Sharma and P. K. Seshan, Copper Oxide Modified Carbon Molecular Sieves for Selective Oxygen Removal, Gas Separation & Purification, vol. 4, Butterworth-Heinemann Ltd, 1990, pp. 203-207.
S. Boumsellek and A. Chutjian, Increased Response of the Reversal Electron Attachment Detector and Modeling of Ion Space-Charge Effects, Anal. Chem. Instrum. 64 (1992), 2096-2100.
M. T. Bernius and A. Chutjian, High-voltage, full-floating 10-MHz square-wave generator with phase control, Rev. Sci. Instrum. 60(4), Apr. 1989, 779-782.
R.K. Asundi et al., Electron Attachment and Ionization in Oxygen, Carbon Monoxide and Carbon Dioxide, Proc. Phys. Doc., 1963, vol. 82, 967-978.
G. J. Schulz, Cross Sections and Electron Affinity for O.sup.- Ions From O.sub.2 CO, and CO.sub.2 by Electron Impact, Phys. Rev., vol. 128, No. 1, Oct. 1962, pp. 178-185.
S. Boumsellek and A. Chutjian, Pulsed, gridded electron reversal ionizer, Rev. Sci. Instrum. 64(5), May 1993, 1135-1139.
O. J. Orient and A. Chutjian, Phys. Rev. A 34 1841 (1986).
Boumsellek Said
Chutjian Ara
Man Kin Fung
Carrillo Sharidan
Kusmiss John H.
The United States of America as represented by the Administrator
Warden Jill
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