“…If the y axis is directed along the trap symmetry axis, the Mathieu equation of one particle motion in dimensionless variables takes the form: where , , U a is the amplitude of the ac voltage on electrodes, V is the dc voltage, which can be applied to electrodes ( V = 0 in our case), is the dimensionless time, b = 2 γmω is the damping parameter. In our previous work [ 23 ] we have determined the boundaries of the confinement region of a charged particle in the linear electrodynamic trap in the presence of friction force. The limiting value of the parameter q x at a x = 0 was 2.45.…”