Fine structure of the stability diagram and the amplitude of ion oscillation within hyperboloidal mass spectrometers

This article shows that the dependence of the amplitude of ion oscillation within a hyperboloidal mass spectrometers (HMS) as a function of working point location on the stability diagram (in this case all working points lie at one scan line) exhibits a structure with spikes: the amplitude decreases drastically in some points and these dips look like 'reversed spikes'. It is shown that the dips appear at particular values of the stability parameter, beta(0), that correspond to intersections of the scan line with lines of parametric resonances (quasistability lines) described by us previously. This effect governs the trapping efficiency of ions injected into a radio-frequency ion trap from an external source.