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Two-frequency operation of a Paul trap to optimise confinement of two species of ions

journal contribution
posted on 2023-06-09, 13:32 authored by C J Foot, D Trypogeorgos, E Bentine, A Gardner, Matthias KellerMatthias Keller
We describe the operation of an electrodynamic ion trap in which the electric quadrupole field oscillates at two frequencies. This mode of operation allows simultaneous tight confinement of ions with extremely different charge-to-mass ratios, e.g., singly ionised atomic ions together with multiply charged nanoparticles. We derive the stability conditions for two-frequency operation from asymptotic properties of the solutions of the Mathieu equation and give a general treatment of the effect of damping on parametric resonances. Two-frequency operation is effective when the two species’ mass ratios and charge ratios are sufficiently large, and further when the frequencies required to optimally trap each species are widely separated. This system resembles two coincident Paul traps, each operating close to a frequency optimized for one of the species, such that both species are tightly confined. This method of operation provides an advantage over single-frequency Paul traps, in which the more weakly confined species forms a sheath around a central core of tightly confined ions. We verify these ideas using numerical simulations and by measuring the parametric heating induced in experiments by the additional driving frequency.

Funding

Quantum Networking with Fibre-Coupled Ions; G0755; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/J003670/1

History

Publication status

  • Published

File Version

  • Published version

Journal

International Journal of Mass Spectrometry

ISSN

1387-3806

Publisher

Elsevier

Volume

430

Page range

117-125

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Atomic, Molecular and Optical Physics Research Group Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2018-05-29

First Compliant Deposit (FCD) Date

2018-05-29

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