Publisher's Note: Evidence of sympathetic cooling of Na<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mo>+</mml:mo></mml:msup></mml:math>ions by a Na magneto-optical trap in a hybrid trap [Phys. Rev. A<b>86</b>, 063419 (2012)]

Sivarajah, Ilamaran; Goodman, Douglas S.; Wells, James; Narducci, Frank A.; Smith, William Hayden

doi:10.1103/physreva.87.019902

Cited by 22 publications

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“…Current experiments utilize laser cooling of atomic ions [1][2][3][4][5][6][9][10][11] or sympathetic cooling of molecular ions [7] in radio frequency (RF) traps with the simultaneous magnetic [2], optical-dipole [3], or magneto-optical trapping and cooling [1,[4][5][6][7] of neutral atoms. These developments have enabled the study of ion-neutral collisional processes down to collision energies corresponding to a few mK.…”

Section: Introductionmentioning

confidence: 99%

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

et al. 2013

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Cold chemical reactions between laser-cooled Ca+ ions and Rb atoms were studied in an ion-atom hybrid trap. Reaction rate constants were determined in the range of collision energies E coll /kB = 20 mK-20 K. The lowest energies were achieved in experiments using single localized Ca + ions. Product branching ratios were studied using resonant-excitation mass spectrometry. The dynamics of the reactive processes in this system (non-radiative and radiative charge transfer as well as radiative association leading to the formation of CaRb + molecular ions) have been analyzed using high-level quantum-chemical calculations of the potential energy curves of CaRb + and quantumscattering calculations for the radiative channels. For the present low-energy scattering experiments, it is shown that the energy dependence of the reaction rate constants is governed by long-range interactions in line with the classical Langevin model, but their magnitude is determined by shortrange non-adiabatic and radiative couplings which only weakly depend on the asymptotic energy. The quantum character of the collisions is predicted to manifest itself in the occurrence of narrow shape resonances at well-defined collision energies. The present results highlight both universal and system-specific phenomena in cold ion-neutral reactive collisions.

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Section: Introductionmentioning

confidence: 99%

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

et al. 2013

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“…Co-trapping ions and atoms [6][7][8][9][10][11][12][13][14] widens the scope of inquiry to the two-particle asymptotic interaction. Among the different methods to cool trapped ions, cooling by elastic collisions with cold neutral atoms is arguably the most generic.…”

Section: Doimentioning

confidence: 99%

“…It is for this reason that hybrid traps combine Paul traps for ions [1] with atom traps such as a MOT [7,[10][11][12][13], magnetic trap [8] or optical dipole trap [8,9,22]. However, due to the dynamic trapping of ions in a Paul trap [1,20], the trapped ions in absence of laser cooling are more energetic than the atoms [12,13].Signature of cooling of trapped ions. The motion of the dynamically trapped ions is described theoretically by the Mathieu equations, which are parameterized in terms of dimensionless and parameters, the values of which characterize the ion trap operation.…”

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“…Ions on the other hand are trapped in Penning or Paul traps [20], of which the latter, a dynamic trap with time varying electric fields, is compatible [15] with overlapped cold atom ensembles because the perturbation of the Paul trap operation on cotrapped cold atoms is negligible [6,21]. It is for this reason that hybrid traps combine Paul traps for ions [1] with atom traps such as a MOT [7,[10][11][12][13], magnetic trap [8] or optical dipole trap [8,9,22]. However, due to the dynamic trapping of ions in a Paul trap [1,20], the trapped ions in absence of laser cooling are more energetic than the atoms [12,13].…”

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Collisional Cooling of Light Ions by Cotrapped Heavy Atoms

2017

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We experimentally demonstrate cooling of trapped ions by collisions with co-trapped, higher mass neutral atoms. It is shown that the lighter 39 K + ions, created by ionizing 39 K atoms in a magneto-optical trap (MOT), when trapped in an ion trap and subsequently allowed to cool by collisions with ultracold, heavier 85 Rb atoms in a MOT, exhibit a longer trap lifetime than without the localized 85 Rb MOT atoms. A similar cooling of trapped 85 Rb + ions by ultracold 133 Cs atoms in a MOT is also demonstrated in a different experimental configuration to validate this mechanism of ion cooling by localized and centered ultracold neutral atoms. Our results suggest that cooling of ions by localized cold atoms holds for any mass ratio, thereby enabling studies on a wider class of atom-ion systems irrespective of their masses. DOI:PACS numbers: 37.10.Rs, 37.10.Ty, 37.10.DeThe cooling and trapping of dilute gases of ions [1,2] and atoms [3] has led to unprecedented precision in spectroscopy [4] and the study of interacting many particle systems [5]. Co-trapping ions and atoms [6][7][8][9][10][11][12][13][14] widens the scope of inquiry to the two-particle asymptotic interaction. Among the different methods to cool trapped ions, cooling by elastic collisions with cold neutral atoms is arguably the most generic. Indeed, this has been extensively used in buffer gas cooling of relatively heavy ions by collisions with cold lower mass neutral atoms. However, the complementary phenomenon, that of cooling of low-mass ions by collisions with heavier neutral atoms, has never been demonstrated experimentally. This is partly because calculations show that trapped ions in a uniform buffer gas will heat up when the ratio of the atom mass ( ) to the ion mass ( ) exceeds a critical value [15][16][17][18]. In recent years, theoretical studies suggest a possible experimental resolution by using a localized ensemble of ultracold neutral atoms placed precisely at the centre of the ion trap [12,19].In ) we demonstrate cooling for, exceed the critical mass ratios (CMRs) [15][16][17][18] beyond which ion heating is predicted for uniform atomic gas densities. The experiment is consistent with our Monte Carlo (MC) simulations and other theoretical models [19] that consider collisions with centrally localized density (as opposed to uniform density) of cold atoms. We further demonstrate the competing ion heating mechanism due to collisions with the background gas vapour. The dependence of steady state ion temperature on the size of the cold atomic cloud is also established numerically. The present work lays the foundation for studies on a wider class of sympathetically cooled ion-atom mixtures and the resulting clarity may enable the realization of the few-partial-wave regime.Trapping and cooling ions and atoms. The conditions and mechanisms for trapping atoms and ions are different because the atom is neutral and the ion charged. Atom traps typically have small trap depths and use a combination of static magnetic and/or optical fields. Ions o...

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“…In particular, atomic ion-atom collisions, charge exchange collisions [6-10], sympathetic cooling of ions by ultracold trapped atoms [5,[10][11][12][13], three body reactions [14][15][16] and molecular ion formation processes [3,17] have been investigated. Two complementary directions motivate key goals for future work, (a) the low partial wave ionatom collisions which explores quantum scattering and many particle physics and (b), the controlled collisions between the cold molecular ions produced in the ionatom traps with co-trapped neutral atoms [18] and with light.…”

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Photodissociation of Trapped Rb2+ : Implications for Simultaneous Trapping of Atoms and Molecular Ions

et al. 2016

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The direct photodissociation of trapped 85 Rb + 2 (rubidium) molecular ions by the cooling light for the 85 Rb magneto-optical trap (MOT) is studied, both experimentally and theoretically. Vibrationally excited Rb + 2 ions are created by photoionization of Rb 2 molecules formed photoassociatively in the Rb MOT and are trapped in a modified spherical Paul trap. The decay rate of the trapped Rb + 2 ion signal in the presence of the MOT cooling light is measured and agreement with our calculated rates for molecular ion photodissociation is observed. The photodissociation mechanism due to the MOT light is expected to be active and therefore universal for all homonuclear diatomic alkali metal molecular ions.PACS numbers: Keywords:The spatially overlapped trapping of cold atoms and ions [1][2][3][4][5][6][7] has significantly expanded our ability to study interactions in cold, dilute gas ensembles. In particular, atomic ion-atom collisions, charge exchange collisions [6-10], sympathetic cooling of ions by ultracold trapped atoms [5,[10][11][12][13], three body reactions [14][15][16] and molecular ion formation processes [3,17] have been investigated. Two complementary directions motivate key goals for future work, (a) the low partial wave ionatom collisions which explores quantum scattering and many particle physics and (b), the controlled collisions between the cold molecular ions produced in the ionatom traps with co-trapped neutral atoms [18] and with light.A critical question which arises is whether the molecular ions can be trapped for a substantial extent of time simultaneously with an ensemble of cold atoms in order to study the interaction between them. In this letter, we address the possibility of simultaneous trapping of 85 Rb + 2 molecular ions with ultracold 85 Rb atoms in a magneto-optical trap (MOT). Our experimental observation shows that the cooling light for the Rb MOT leads to rapid destruction of the measured Rb + 2 ion signal. We measure the lifetime of trapped Rb + 2 in the presence of 780.2413 nm (≡ 12816.54 cm −1 ) light to be 495±80 ms. We discuss possible dissociation mechanisms and show that the experimental observation is in agreement with our theoretical calculations for the photodissociation of Rb + 2 molecular ions.The observed photodissociation mechanism is expected to be universal to all diatomic homonuclear alkali molecular ions as they exhibit similar potential energy characteristics.The experimental system consists of an ion-atom hybrid trap assembly as shown in Fig. 1. The detailed description of the experimental system can be found in ear- lier work [5,19,20]. Briefly, the hybrid trap consists of a MOT for atoms and a modified spherical Paul trap made of four tungsten wire loops in a square shape geometry for trapping ions. The ion trap radio frequency (rf) of 500 kHz with 150 V amplitude is applied to the inner pair of wires and a small (-5 V) constant potential is applied on the outer wires. The ion trap is operated at the optimal trapping voltage for Rb + 2 ions. For the expe...

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Publisher's Note: Evidence of sympathetic cooling of Na+ions by a Na magneto-optical trap in a hybrid trap [Phys. Rev. A86, 063419 (2012)]

Cited by 22 publications

References 0 publications

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Collisional Cooling of Light Ions by Cotrapped Heavy Atoms

Photodissociation of Trapped Rb2+ : Implications for Simultaneous Trapping of Atoms and Molecular Ions

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Publisher's Note: Evidence of sympathetic cooling of Na+ions by a Na magneto-optical trap in a hybrid trap [Phys. Rev. A86, 063419 (2012)]

Cited by 22 publications

References 0 publications

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca+ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca+ ions and Rb atoms in an ion-atom hybrid trap

Collisional Cooling of Light Ions by Cotrapped Heavy Atoms

Photodissociation of Trapped Rb2+ : Implications for Simultaneous Trapping of Atoms and Molecular Ions

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Product

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Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap