Trajectories of Microparticles of Different Signs in a Quadrupole Trap with a Rectangular Voltage

Experimental studies and computer modeling of the charge sign effect of dielectric microparticles ontheir movement trajectories in a linear quadrupole trap with a pulse-periodic alternating retaining voltage of a rectangular shape with a frequency of 50 Hz in air at atmospheric pressure have been carried out. It was found that, unlike the sinusoidal holding voltage, the trajectories of particles in the cross section of the trap are arranged diagonally, and particles with charges of different signs oscillate along perpendicular diagonals. When the filling factor of the positive polarity of a rectangular pulse changes by more than 50%, the diagonal of the particles motion changes depending on the sign of their charge. The effect was obtained experimentally and is consistent with the calculation.