| 摘要 |
The invention relates to mass spectrometers in which ion clouds are stored in two spatial directions by radial forces while oscillating largely harmonically at a mass-specific frequency in a third spatial direction perpendicular to the other two, in a potential minimum, which is generally paraboloidal in shape. Analysis of the oscillation frequencies of these ion clouds, preferably by means of a Fourier analysis, leads via a frequency spectrum to a mass spectrum. The invention consists in identifying false signals in the frequency spectrum as harmonics of a fundamental oscillation of a sample ion, and eliminating them where necessary. This may be achieved by analyzing each frequency peak and establishing whether it is a precise integer fraction or multiple of any other oscillation signal in the frequency domain data, and by comparing the signal height ratios of the spectrum with an instrument-specific spectrum of the harmonics for the mass spectrometer being used. |
