Method for eliminating undesirable charged particles from the me

Details Method for eliminating undesirable charged particles from the me Method for eliminating undesirable charged particles from the me

1987-08-05

1989-04-04

Fields, Carolyn E.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250290, 250292, 250293, 250282, H01J 4936

Patent

active

048188646

ABSTRACT:
For eliminating undesirable charged low-mass particles from the measuring cell of an ion cyclotron resonance spectrometer the electrodes normally required for exciting the cyclotron movement are supplied with an rf voltage having a frequency twice as high as the resonance frequency of the trapping oscillation of the charged particles between the trapping electrodes provided perpendicularly to the homogenous magnetic field of the spectrometer. In this manner, the low-mass charged particles are excited to perform trapping oscillations in the direction of the homogenous magnetic field which cause the charged particles to overcome the trapping potentials and, thus, to be eliminated.

REFERENCES:
patent: 4464520 (1984-08-01), Allemann et al.
patent: 4535235 (1987-08-01), McIver et al.
patent: 4686365 (1987-08-01), Meek et al.
Huang et al, "Mass-Dependent Z-Excitation of Ions in Cubic Traps Used in Films", Internal Journal of Mass Spectrometry and Ion Processes, 72(1986) pp. 15-31.
Baykut et al, "Fourier Transform Ion Cyclotron Resonance Mass Spectrometry", trends in analytical chemistry, vol. 5, No. 2, Feb. 1986, pp. 44-49.
"Messtechnik 6/70" Karl-Heinz Lebert, Frankfurt: Ionen-Cyclotronresonanz zur Untersuchung Ion-Molekul-Reaktionen, pp. 109 through 115.

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