Method and device for the digital generation of an additional al

Details Method and device for the digital generation of an additional al Method and device for the digital generation of an additional al

1994-05-19

1995-08-01

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250282, H01J 4942

Patent

active

054381959

ABSTRACT:
A method and a device for the mass selective excitation of the secular oscillations of selected ion types in an RF quadrupole ion trap, including the simultaneous excitation of more than one ion type, is disclosed. The secular oscillation frequency is excited by resonances with specific frequencies of the frequency bands of the additional alternating fields, the frequency bands being generated digitally at a basic pulse rate .OMEGA.. Interfering frequency side bands .OMEGA.-.omega., .OMEGA.+.omega., 2.OMEGA.-.omega., 2.OMEGA.+.omega., etc. arise, however, for each frequency .omega. within the frequency bands. These side bands can excite and eliminate other ions, which are not to be eliminated, in an undesired manner. The invention comprises forming the side bands in such a way that they only excite the selected ions. This is done by making the basic pulse rate for digital generation of the frequency bands for the additional alternating voltage identical with the frequency of the drive voltage of the ion trap or with an integral multiple of it and coupling the basic pulse rate to it in locked phase relation.

REFERENCES:
patent: 4761545 (1988-08-01), Marshall et al.
patent: 5134286 (1992-07-01), Kelley
patent: 5198665 (1993-03-01), Wells
patent: 5347127 (1994-09-01), Franzen
Fernande Vedel, et al., A Sensitive Method For The Detection Of Stored Ions By Resonant Ejection Using A Wide-Band Signal pp. R11-R20, 1991.

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