Measurement of low-energy Na^+ -- Na total collision rate in an ion--neutral hybrid trap

Abstract

We present measurements of the total elastic and resonant charge-exchange ion-atom collision rate coefficient $k_{\mathrm{ia}}$ of cold sodium (\ce{Na}) with optically-dark low energy \ce{Na+} ions in a hybrid ion-neutral trap. To determine $k_{\mathrm{ia}}$, we measured the trap loading and loss from both a \ce{Na} magneto-optical trap (MOT) and a linear radio frequency quadrupole Paul trap. We found the total rate coefficient to be $7.4\pm 1.9\times 10^{-8}$ cm${}^3$/s for the type I \ce{Na} MOT immersed within an $\approx 140$ K ion cloud and $1.10\pm 0.25\times 10^{-7}$ cm${}^3$/s for the type II \ce{Na} MOT within an $\approx 1070$ K ion cloud. Our measurements show excellent agreement with previously reported theoretical fully quantal \textit{ab initio} calculations. In the process of determining the total rate coefficient, we demonstrate that a MOT can be used to probe an optically dark ion cloud's spatial distribution within a hybrid trap.

arXiv comment14 pages, 15 figures

References in corpus (28)

• Quantum computation with trapped polar molecules
• Theory and applications of atomic and ionic polarizabilities
• A trapped single ion inside a Bose-Einstein condensate
• Dynamics of a cold trapped ion in a Bose-Einstein condensate
• Observation of Cold Collisions between Trapped Ions and Trapped Atoms
• Light-assisted ion-neutral reactive processes in the cold regime: radiative molecule formation vs. charge exchange
• Micromotion-induced Limit to Atom-Ion Sympathetic Cooling in Paul Traps
• Controlling chemical reactions of a single particle
• Sympathetic and swap cooling of trapped ions by cold atoms in a MOT
• Quantum theory of ultracold atom-ion collisions
• Cold heteronuclear atom-ion collisions
• Radiative charge transfer lifetime of the excited state of (NaCa)${}^{+}$
• Ion-neutral chemistry at ultralow energies: Dynamics of reactive collisions between laser-cooled Ca^+ ions and Rb atoms in an ion-atom hybrid trap
• A new method for producing ultracold molecular ions
• Neutral gas sympathetic cooling of an ion in a Paul trap
• Evidence of sympathetic cooling of Na+ ions by a Na MOT in a hybrid trap
• Reactive collisions of trapped anions with ultracold atoms
• The role of electronic excitation in cold atom-ion chemistry
• Observation of elastic collisions between lithium atoms and calcium ions
• Measurement of collisions between rubidium atoms and optically dark rubidium ions
• About the dynamics and thermodynamics of trapped ions
• Observation of single collisionally cooled trapped ions in a buffer gas
• Ion-neutral sympathetic cooling in a hybrid linear rf Paul and magneto-optical trap
• Trapping molecular ions formed via photo-associative ionization of ultracold atoms
• Combined ion and atom trap for low temperature ion-atom physics
• Ultracold, radiative charge transfer in hybrid Yb ion - Rb atom traps
• Quantum-defect theory of resonant charge exchange
• Off-resonance energy absorption in a linear Paul trap due to mass selective resonant quenching

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