Control of Screening of a Charged Particle in Electrolytic Aqueous Paul Trap

Conference · Sun May 01 00:00:00 EDT 2011

DOI:https://doi.org/10.1063/1.3586077· OSTI ID:1095627

Park, Jae Hyun nmn ^[1]; Krstic, Predrag S. ^[1]

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1. ORNL

Individual charged particles could be trapped and confined in the combined radio-frequency and DC quadrupole electric field of an aqueous Paul trap. Viscosity of water improves confinement and extends the range of the trap parameters which characterize the stability of the trap. Electrolyte, if present in aqueous solution, may screen the charged particle and thus partially or fully suppress electrophoretic interaction with the applied filed, possibly reducing it to a generally much weaker dielectrophoretic interaction with an induced dipole. Applying molecular dynamics simulation we show that the quadrupole field has a different affects at the electrolyte ions and at much heavier charged particle, effectively eliminating the screening effect and reinstating the electrophoretic confinement.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1095627
• Country of Publication: United States
• Language: English