Radiant energy – Ionic separation or analysis
Patent
1991-01-25
1993-01-19
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
250283, 250305, A01J 4900, B01D 5944
Patent
active
051809133
ABSTRACT:
The invention relates to a method and a mass spectrometer for mass spectroscopic or mass spectrometric investigation of particles. The particles are separated in a separating system in accordance with their different masses. In order to reduce detection errors due to scattered particles, there is arranged upstream of a detecting device a correction device which builds up a braking potential in order to suppress particles having an energy loss due to scattering. The invention provides a further, preferably combined correction, by means of which the particles are selected as a function of their direction of motion. For this purpose, the mass spectrometer according to the invention preferably has at least one braking electrode and one quadrupole lens.
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patent: 4766314 (1988-08-01), Jung
patent: 4789780 (1988-12-01), Le Poole et al.
patent: 4800273 (1989-01-01), Phillips
patent: 4823013 (1989-04-01), Van der Mast
patent: 5043575 (1991-08-01), Habfast et al.
"Retarding-Field Differential-Output Energy Prefilter for High-Performance Secondary Ion Mass Spectrometry", Thompson et al., Rev. Sci. Inst., vol. 56, No. 8, Aug. 1985, pp. 1557-1563.
Anderson Bruce C.
Finnigan Mat GmbH
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