Radiant energy – Ionic separation or analysis
Patent
1985-12-24
1990-09-18
Berman, Jack I.
Radiant energy
Ionic separation or analysis
250282, 250283, 250299, 313103R, 328243, H01J 4300, H01J 4902
Patent
active
RE0333441
ABSTRACT:
[A negative ion detector converts negative ions to positive ions by means of a conversion anode which is maintained at a relatively high positive voltage. The resultant positive ions are detected by a standard continuous dynode electron multiplier which has its detection signal output at ground potential.] Apparatus for detecting the abundance of negative ions from a source of negative ions, having a first conversion dynode and an electron multiplier, the electron multiplier having a second conversion dynode. The first conversion dynode is operated at a high positive potential to attract the negative ions whereby the negative ions impact the first conversion dynode with a substantial portion of the negative ions being converted to secondary positive ions. The second conversion dynode is operated at a potential which is less positive than the positive potential on the first conversion dynode to attract the secondary positive ions and to cause the secondary positive ions to be converted to electrons which are multiplied in the electron multiplier to provide an output signal indicative of the abundance of negative ions emanating from the source.
REFERENCES:
patent: 2213140 (1940-08-01), Kallmann et al.
patent: 2816243 (1957-12-01), Herb et al.
patent: 3136908 (1964-06-01), Weinman
patent: 3573454 (1971-04-01), Andersen et al.
patent: 3660655 (1972-05-01), Wardell
patent: 3730696 (1973-05-01), Pointu et al.
patent: 3774028 (1973-11-01), Daly
patent: 3786359 (1974-01-01), King
patent: 3898456 (1975-08-01), Dietz
patent: 4037100 (1977-07-01), Purser
patent: 4066894 (1978-01-01), Hunt et al.
patent: 4093855 (1978-06-01), Fite et al.
patent: 4267448 (1981-05-01), Feser et al.
Large Aperture Detector by Gibbs & Cummins Rev. Sci. Inst. vol. 37, No. 10, Oct. 1966, pp. 1385-1390.
Secondary Positive Ion . . . by Bradley Jour. Applied Physics vol. 30, No. 1, Jan. 1959, pp. 1-8.
Larsen et al., Int. J. Mass Spectrometry and Ion Physics, vol. 11, pp. 149-155 (1973).
Andersen, J. Mass Spectrometry and Ion Physics, vol. 2 (1969), pp. 61-74.
Andersen, J. Mass Spectrometry and Ion Physics, vol. 3 (1970), pp. 413-428.
Andersen et al., Science, Feb. 1972, pp. 853-860.
Andersen, Microprobe Analysis, pp. 531-553.
Benninghoven et al., Physics Letters, vol. 40A, No. 2, Jul. 2, 1972, pp. 169-170.
Baumgartner et al., J. Physics E: Scientific Instruments, vol. 9, 1976, pp. 321-329.
Goodings et al., Int. J. Mass Spectrometers and Ion Physics, vol. 9, 1972, pp. 417-420.
La Lau, Advances in Analytic Chemistry and Instrumentation, vol. 8, 1970, pp. 93-120.
Gibbs et al., Review of Scientific Instruments, vol. 37, No. 10, Oct. 1966, pp. 1385-1390.
Bradley, Jour. Applied Physics, vol. 30, No. 1, Jan. 1959, pp. 1-8.
Ridley, Nuclear Instruments and Methods, vol. 14, 1961, pp. 231-236.
Berman Jack I.
Finnigan Corporation
LandOfFree
Apparatus and method for detecting negative ions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for detecting negative ions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for detecting negative ions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1564387