A simulation study of excitation contour of a linear trap with spatial harmonics

The process of nonlinear resonant excitation of ion oscillations in a linear trap is studied. There is still no detailed simulation of the resonance peak in the literature. We propose to use the excitation contour to describe the collective ion resonance. The excitation contour is a resonant mass peak obtained by the trajectory method with the Gaussian distribution of the initial coordinates and velocities. The following factors are considered: excitation time, low order hexapole and octopole harmonics with amplitudes A(3) and A(4), the depth of the initial ion cloud position. These multipoles are used for selective ion ejection from linear ion trap. All these factors affect the ion yield and the shape of the contours. Obtained data can be useful for control of such processes as ion fragmentation, ion isolation, ion activation, and ion ejection. Simulated resonance peaks are important for the theoretical description of the ion collective nonlinear resonances.

Automated summary

The study focuses on the nonlinear resonant excitation of ion oscillations in a linear trap, proposing the use of excitation contour to describe collective ion resonance. Factors such as excitation time, harmonic amplitudes, and initial ion cloud position depth are considered in the simulation of resonance peaks. The results can be beneficial for controlling processes like ion fragmentation and ion ejection.