Radiant energy – Ionic separation or analysis – Methods
Patent
1994-08-05
1996-09-24
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Methods
250292, G01D 5944, H01J 4900
Patent
active
055593259
ABSTRACT:
The invention relates to a method of automatically controlling the space charge in ion traps when they are used as a mass spectrometer. If ionization conditions remain the same, space charge is proportional to the measured concentration of a substance; if there are rapid changes in substance concentrations, as can be found in coupling with gas chromatography for example, the space charge must be controlled to obtain spectra of consistent quality. The invention is based on the possibility of performing rapid consecutive scans and consists in utilizing the integrated ion currents of consecutive spectra to forecast by calculation the value of the ion generation rate at the time of the ionization phase for the next scan. Calculation may be based on linear, quadratic or cubic extrapolation but also on assumptions regarding the function of change of the concentration, and an adaptation of the function parameters.
REFERENCES:
patent: 4540884 (1985-09-01), Stafford et al.
patent: 4771172 (1988-09-01), Weber-Grabau et al.
patent: 5107109 (1992-04-01), Stafford, Jr. et al.
patent: 5367162 (1994-11-01), Holland et al.
Anderson Bruce C.
Bruker-Franzen Analytik GmbH
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