Method of calibrating ion cyclotron resonance spectrometers

Details Method of calibrating ion cyclotron resonance spectrometers Method of calibrating ion cyclotron resonance spectrometers

1982-08-05

1985-02-19

Smith, Alfred E.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

2502521, H01J 4936, G01D 1800

Patent

active

045007829

ABSTRACT:
In the calibration of ion cyclotron resonance spectrometers there may be used the first upper sideband of the resonance frequency of known sample substances because it was found that the frequency of the first upper sideband is approximately equal to the true cyclotron resonance frequency .omega..sub.c =(q/m)B. If only one line is available for the calibration, the frequency .omega..sub.R of the first upper sideband is set equal to the true cyclotron resonace frequency .omega..sub.c in the relation ##EQU1## which is used for calibration. If multiple lines are available, a more exact calibration is possible by using the relation ##EQU2## where .omega..sub.cor is a correction frequency. The effective resonance frequency .omega..sub.eff is separated from the upper sideband by a value .DELTA..omega. which, in a good approximation, is independent of m/q. In determining the mass by way of the carrier line, an equation of the above type may be used wherein the displacement of the carrier line with respect to the sideband is taken into account by the term .omega..sub.cor.

REFERENCES:
Sharp et al., "Trapped Ion Motion . . . ", Int. J. Mass Spectrom, Ion Phys., 9(1972) pp. 421-439.
Ledford et al., "Exact Mass Measurement . . . ", Anal. Chem., vol. 52, No. 3, Mar. 1980, pp. 463-468.
Allemann et al., "A New Fourier-Transform Mass Spectrometer . . . ", Chemical Physics Letters, vol. 75, No. 2, Oct. 15, 1980, pp. 328-331.
Pendlebury et al., "Precision Field Averaging NMR Magnetometer . . . ", Rev. Sci. Instrum., 50(5), May 1979, pp. 535-540.

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