Method and device for control of the excitation voltage for ion

Details Method and device for control of the excitation voltage for ion Method and device for control of the excitation voltage for ion

1992-12-23

1994-03-29

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250282, H01J 4942

Patent

active

052987469

ABSTRACT:
An improved scanning method used in an ion trap mass spectrometer comprises controlling the amplitude of the excitation RF during the mass scan to produce a smooth, nonlinear, highly suitable function. A smooth function is a function with a steady derivative. According to one embodiment of the invention, the excitation amplitude is set proportionally to the square root of the storage amplitude, thus making the excitation amplitude proportional to the root of the mass number.

REFERENCES:
patent: 5173604 (1992-12-01), Kelley
patent: 5182451 (1993-01-01), Schwartz et al.

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