Trapping and cooling of Ions and the study of Ion atom interactions

Sympathetic cooling of Rb+ ions by cold Rb atoms is studied in an ion-neutral hybrid trap. The effect of a linear Paul trap (LPT) parameter q1, 2 on the sympathetic cooling is studied by measuring the changes in ion number Ni and temperature Ti after interaction with cold atoms. The sympathetic cooling effect is observed with 0.3 ≤ |q1, 2| ≤ 0.8. At the |q1, 2| value of 0.32, ions are cooled from initial (2 010±380) K to (325±35) K and the lifetime of ions is extended from 7 s to 15 s via sympathetic cooling. These findings are very useful for cooling of atomic and molecular ions, especially for the ions without available optical channels.Sympathetic cooling of Rb+ ions by cold Rb atoms is studied in an ion-neutral hybrid trap. The effect of a linear Paul trap (LPT) parameter q1, 2 on the sympathetic cooling is studied by measuring the changes in ion number Ni and temperature Ti after interaction with cold atoms. The sympathetic cooling effect is observed with 0.3 ≤ |q1, 2| ≤ 0.8. At the |q1, 2| value of 0.32, ions are cooled from initial (2 010±380) K to (325±35) K and the lifetime of ions is extended from 7 s to 15 s via sympathetic cooling. These findings are very useful for cooling of atomic and molecular ions, especially for the ions without available optical channels.

Mar 15, 20180 citations

Chapter 6 Trapping and Cooling Ions

Laurent Hilico, Martina Knoop

EDP Sciences eBooksDec 31, 20220 citations

Micromotion-Induced Limit to Atom-Ion Sympathetic Cooling in Paul Traps

Marko Cetina, Andrew T. Grier, Vladan Vuletić

We present, and derive analytic expressions for, a fundamental limit to the sympathetic cooling of ions in radio-frequency traps using cold atoms. The limit arises from the work done by the trap electric field during a long-range ion-atom collision and applies even to cooling by a zero-temperature atomic gas in a perfectly compensated trap. We conclude that in current experimental implementations, this collisional heating prevents access to the regimes of single-partial-wave atom-ion interaction or quantized ion motion. We determine conditions on the atom-ion mass ratio and on the trap parameters for reaching the s-wave collision regime and the trap ground state.We present, and derive analytic expressions for, a fundamental limit to the sympathetic cooling of ions in radio-frequency traps using cold atoms. The limit arises from the work done by the trap electric field during a long-range ion-atom collision and applies even to cooling by a zero-temperature atomic gas in a perfectly compensated trap. We conclude that in current experimental implementations, this collisional heating prevents access to the regimes of single-partial-wave atom-ion interaction or quantized ion motion. We determine conditions on the atom-ion mass ratio and on the trap parameters for reaching the s-wave collision regime and the trap ground state.

arXiv:1205.2806Physical Review LettersDec 19, 2012156 citations

Chapter 6 Trapping and Cooling Ions

Laurent Hilico, Martina Knoop

EDP Sciences eBooksDec 31, 20220 citations

Session C1: APS, AAPT, and SPS Poster Session - Sympathetic Cooling of Na+ Ions by Ultra-cold Na Atoms in a Hybrid trap

I. Sivarajah, Goodman, Douglas, James E. Wells +1 more

Closed shell ions like Na+, as well as many molecular ions, cannot be easily laser cooled, for spectroscopy, quantum gates, and near zero-K reaction studies. We report on experiments studying collisions between trapped ions and trapped cold atoms. The ion-atom interaction is dominated by long-range polarization forces, principally a term V $\sim -\alpha $ /R $^{4}$ , $\alpha $ being the dipole polarizability of the neutral. The Hybrid trap consists of a linear Paul ion trap, set to trap Na+ ions, centered on a sodium magneto-optical trap (MOT). We investigate the sympathetic cooling of the (equal atomic mass) Na+ ion cloud concentric with the MOT, using either the 3s F=2$\to $3p F$ ^{\prime} $=3 or the 3s F=2$ \to $3p F$ ^{\prime}$= 2 MOT transitions. The lifetime of the ions in the Paul trap is observed to be detectably longer when they are sympathetically cooled by the cold neutral MOT atoms, consistent with simulations via SIMION.Closed shell ions like Na+, as well as many molecular ions, cannot be easily laser cooled, for spectroscopy, quantum gates, and near zero-K reaction studies. We report on experiments studying collisions between trapped ions and trapped cold atoms. The ion-atom interaction is dominated by long-range polarization forces, principally a term V $\sim -\alpha $ /R$^{4}$, $\alpha $ being the dipole polarizability of the neutral. The Hybrid trap consists of a linear Paul ion trap, set to trap Na+ ions, centered on a sodium magneto-optical trap (MOT). We investigate the sympathetic cooling of the (equal atomic mass) Na+ ion cloud concentric with the MOT, using either the 3s F=2$\to $3p F$^{\prime}$=3 or the 3s F=2$\to $3p F$^{\prime}$= 2 MOT transitions. The lifetime of the ions in the Paul trap is observed to be detectably longer when they are sympathetically cooled by the cold neutral MOT atoms, consistent with simulations via SIMION.

Nov 18, 20110 citations

Structure and Dynamics of Trapped Ions

Joel H. Parks

CRC Press eBooksNov 11, 20092 citations

^{4}

, $\alpha $ being the dipole polarizability of the neutral. The Hybrid trap consists of a linear Paul ion trap, set to trap Na+ ions, centered on a sodium magneto-optical trap (MOT). We investigate the sympathetic cooling of the (equal atomic mass) Na+ ion cloud concentric with the MOT, using either the 3s F=2$\to

3p F

^{\prime}

=3 or the 3s F=2

\to

3p F

^{\prime}$= 2 MOT transitions. The lifetime of the ions in the Paul trap is observed to be detectably longer when they are sympathetically cooled by the cold neutral MOT atoms, consistent with simulations via SIMION.