Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1999-09-30
2000-11-28
Nguyen, Kiet T.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
H01J 4942
Patent
active
061538809
ABSTRACT:
A mass spectrometer method and apparatus improve resolution and sensitivity. A voltage supply is coupled to a mass filter for applying a radio frequency voltage and for operating at at least one selected frequency. An ion optical element such as an entrance lens is driven by a voltage supply that is phase coherent with the voltage applied to the mass filter. The ion beam is tailored so that the phase space relationship of the ions is more closely matched to the acceptance of the mass filter. The ions in the incoming beam are dynamically matched to the acceptance of the mass filter over each cycle of the voltage applied to the mass filter. The ion optical element may be a single entrance lens to which is applied only a single phase coherent voltage.
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Dowell Jerry T.
Fischer Steven M.
Russ, IV Charles William
Agilent Technologie,s Inc.
Nguyen Kiet T.
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