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The ion-optical properties of the second stability region ( q = 4.5 ) formed by the square wave shape potential with a duty cycle of 50% are studied as applied to the operation of a linear ion trap. The stability diagram is presented in detail, the stability parameters β x and β y , which determine the spectrum of ion oscillations, are calculated; the pseudopotential well-depth for this zone is given. The LIT acceptances for sinusoidal and rectangular wave forms are shown for comparison. Based on the obtained data, the excitation contour is modeled using the trajectory method, where a resolution of 25,000 without using gas damping is found.

26:T52c,

In this study, an analytical approximation that can be used to estimate the change in the electric field caused by the introduction of circular slits on endcap electrodes of toroidal ion trap mass analysers will be developed. A theory has been developed to estimate the contribution of circular slits on the electrodes of a toroidal ion trap. In this theory, the first potential due to an arbitrary aperture on an infinite ground plane will be derived. This will be specialised to obtain potential due to a circular slit on an infinite ground plane. The potential due to a circular slit on an infinite ground plane will be used to evaluate the field within the toroidal traps having circular slits. The approximation developed in this paper has been verified on two arbitrarily selected toroidal traps. One of these arbitrary traps has circular-shaped electrodes, and the other trap has asymmetric hyperbolic-shaped electrodes. Fields estimated by this approximation agree well with those obtained using the boundary element method. Additionally, the study reveals an interesting correlation between the secular frequency of ion motion and the width of the circular slit. The secular frequency reduces as the slit width is increased. The reduction in secular frequency is proportional to the square of the slit width.

27:T5c2,