Radiant energy – Ionic separation or analysis – Methods
Patent
1996-01-19
1997-08-05
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Methods
250292, H01J 4942
Patent
active
056545428
ABSTRACT:
A method for the simultaneous resonant excitation of the oscillations of ions of various mass-to-charge ratios in ion traps, particularly for the ejection of undesirable ion species, by applying RF frequencies with various frequency components to electrodes of the ion trap. The method consists in generating and storing a broadband signal for as short a time as possible so that it can be fed to the ion trap a number of times in succession cyclically, without generating undesirable interference due to phase shifts. The excitation of the ions should be as temporally constant as possible throughout the waveform period. The duration of the waveform period depends on the mass resolution required. Excitation is terminated by controlling the broadband signal gradually toward zero in a constant function.
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Franzen Jochen
Schubert Michael
Berman Jack I.
Bruker-Franzen Analytik GmbH
Nguyen Kiet T.
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