Confinement of ions in a radio frequency quadrupole ion trap supplied with a periodic impulsional potential

This article explains the confinement of the ion in the first stability region of the three-dimensional radio frequency quadrupole ion trap using a periodic impulsional potential of the form V-0 cos Omega t/(1 - k cos 2 Omega t) with 0 less than or equal to k < 1. Numerical computations have been used to study the different aspects of impulsional potential when k = 0.8, and compared with a sinusoidal potential k = 0 for some value of equivalent points: two operating points located in their corresponding stability diagram having the some beta(z). (C) 1999 Elsevier Science B.V.