High frequency mass spectrometer

Details High frequency mass spectrometer High frequency mass spectrometer

1995-08-22

1996-10-15

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250290, B01D 5944, H01J 4900

Patent

active

055656803

ABSTRACT:
A compact mass spectrometer apparatus is presented to enable accurate qualitative and quantitative analyses of target ions. The apparatus can operate in a relatively poor vacuum in the range of 10.sup.-2 to 10.sup.-3 torr compared with the conventional requirement of 10.sup.-6 to 10.sup.-8 torr while providing precision results with lesser number of electrodes than the conventional mass spectrometer. The separation of the ionic species is achieved through two effects: flight time differentials produced by varying mass/charge ratios of the sample ions; as well as high frequency resonance separation by synchronizing the injection of ions with high frequency electric field applied to an electrode system having equi-potential space and high frequency space. The resulting dispersion in the wide energy spectra of the sample ions serves to accurately identify the sample ions both qualitatively and quantitatively. The spectra dispersion is achieved by modulating the ion beam with application of suitable magnitude and phase angle of the high frequency voltage, and allowing only those ions having the maximum kinetic energy to pass through to a collector electrode. The analyses are based on measurements of the maximum ion current flowing in the collector electrode.

REFERENCES:
patent: 2818507 (1957-12-01), Britten
patent: 2911532 (1959-11-01), Tipotsch
patent: 2939126 (1960-05-01), Barghausen
patent: 2959676 (1960-11-01), Burk
patent: 3107295 (1963-10-01), Tretner
Blauth, "Dynamic Mass Spectrometers", pp. 37-45, Elsevier Publishing Company (1966).
International Journal of Mass Spectrometry and Ion Processes, vol. 59, No. 3, Aug. 1984, Amsterdam NL, pp. 303-313, R. Eng et al., "Study Of The Background Currents In The Radiofrequency Mass Spectrometer".

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