Method for controlling the ion generation rate for mass selectiv

Details Method for controlling the ion generation rate for mass selectiv Method for controlling the ion generation rate for mass selectiv

1996-01-19

1998-01-20

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Methods

250292, H01J 4942

Patent

active

057104271

ABSTRACT:
A method of mass selective loading of ion traps by ejection of undesirable ion species during the loading process by applying RF voltages with a mixture of frequency components to the trap electrodes. For several mass spectrometric investigations only ions with desired mass-to-charge ratios are to be loaded into the ion trap in order to achieve a more efficient utilization of the limited storage capability of the ion trap. The generation rate of the ions during the loading process in such a way that the equilibrium of the space charge inside the ion trap, balanced between ion generation rate and ion ejection rate, does not significantly deteriorate the mass resolution of the ejection process.

REFERENCES:
patent: 4771172 (1988-09-01), Weber-Grabau et al.
patent: 5107109 (1992-04-01), Stafford, Jr. et al.
patent: 5134286 (1992-07-01), Kelley
patent: 5324939 (1994-06-01), Louris et al.
patent: 5448061 (1995-09-01), Wells
patent: 5479012 (1995-12-01), Wells
patent: 5559325 (1996-09-01), Franzen

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