Multipole electrodynamic ion trap geometries for microparticle confinement under standard ambient temperature and pressure conditions

Abstract

Trapping of microparticles and aerosols is of great interest for physics and chemistry.We report microparticle trapping in case of multipole linear Paul trap geometries, operating under Standard Ambient Temperature and Pressure (SATP) conditions. An 8-electrode and a 12-electrode linear trap geometries have been designed and tested with an aim to achieve trapping for larger number of particles and to study microparticle dynamical stability in electrodynamic fields. We report emergence of planar and volume ordered structures of microparticles, depending on the a.c. trapping frequency and particle specific charge ratio. The electric potential within the trap is mapped using the electrolytic tank method. Particle dynamics is simulated using a stochastic Langevin equation. We emphasize extended regions of stable trapping with respect to quadrupole traps, as well as good agreement between experiment and numerical simulations.

Outside localization around a toroidal electrode of a Paul trap

“…We performed the localization in air and used a low-frequency AC voltage to compensate the gravitational force. Since the depth of the effective potential is inversely proportional to the frequency, Φ n[1] ∝1/Ω 2 from (16), this configuration is suitable to localize even particles of more than 10 −5 m size [20,33,34]. Localization dynamics of such particles is in agreement with the model of nonlinear damping [20], which allows to estimate the quasi-equilibrium points taking into account cubic nonlinearities (discussed in section 2.2).…”

Squeezed coherent states of motion for ions confined in quadrupole and octupole ion traps

“…Numerical simulations performed validate experimental data and observations [40]. Recent investigations are focused on producing planar Coulomb crystals using specially designed linear multipole traps [37,41,42].…”

Wave‐like excitations in the system of a charged long filament interacting with the microparticles in the linear Paul trap

“…[3] In the neutral gas media, levitating structures from charged dust particles can be observed in altering electrodynamic field, for example, of the Paul traps. [10][11][12][13][14][15][16] The Paul trap can be also used for investigation properties of individual particles [17][18][19] and clusters [20][21][22] not only in neutral gas media but also in vacuum.…”