Method and device for in-phase excitation of ion ejection from i

Details Method and device for in-phase excitation of ion ejection from i Method and device for in-phase excitation of ion ejection from i

1992-12-23

1994-09-13

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250282, B01D 5944, H01J 4900

Patent

active

053471270

ABSTRACT:
An improvement of a fast scanning method in an ion trap mass spectrometer comprises setting the frequency and phase relationships between the ion trap storage frequency and the ion trap excitation frequency in such a way that the ions of consecutive masses each gain precisely the same "phase rhythm" or "phase sequence". The phase rhythm, or the historical succession of phase positions up to ion ejection, is optimally set in accordance with nonlinear resonance conditions used to cause ion ejection. The excitation voltage frequency is set to a value somewhat smaller that an integral fraction of the storage voltage frequency and the scan profile is set based on the excitation frequency so that the same time is required for ions of each mass to be ejected and so that precisely an integer number of cycles of the excitation frequency is used per mass.

REFERENCES:
patent: 4573175 (1986-02-01), Cressey
patent: 4650999 (1987-03-01), Fies et al.
patent: 5028777 (1991-07-01), Franzen et al.

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