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

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

doi:10.1103/physreva.86.063419

Cited by 61 publications

(49 citation statements)

References 58 publications

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“…Similarly, an optical dipole trap of Rb atoms has been merged in a Paul trap containing a few Ba + atoms [27,28] (or with the combination Li/Ca + [29]). When atomic ions like Rb + or Na + cannot be laser-cooled, they can be sympathetically cooled by another species in the Paul trap in the presence of trapped Rb atoms [28,30] or Na atoms [31], or they can be created in situ inside the Paul trap by photoionization of trapped Rb atoms [32][33][34]. To be complete, sympathetically-cooled molecular ions created from an external source have been utilized in two remarkable experiments: one has demonstrated the vibrational quenching of BaCl + ions by laser-cooled Ca atoms [35], and another one has recorded a particularly large charge-exchange rate between N 2 + ions and laser-cooled Rb atoms [36].…”

Section: Introductionmentioning

confidence: 99%

Formation of molecular ions by radiative association of cold trapped atoms and ions

et al. 2015

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Radiative emission during cold collisions between trapped laser-cooled Rb atoms and alkaline-earth ions (Ca + , Sr + , Ba + ) and Yb + , and between Li and Yb + , are studied theoretically, using accurate effective core potential based quantum chemistry calculations of potential energy curves and transition dipole moments of the related molecular ions. Radiative association of molecular ions is predicted to occur for all systems with a cross section two to ten times larger than the radiative charge transfer one. Partial and total rate constants are also calculated and compared to available experiments. Narrow shape resonances are expected, which could be detectable at low temperature with an experimental resolution at the limit of the present standards. Vibrational distributions are also calculated, showing that the final molecular ions are not created in their ground state level. p c k J J D R J J J D R J PEC for all systems. The lowest Π 3 PEC of Rb-Ca + is also displayed for completeness. (c) Transition electric dipole moments between the X and A states. Open circles: [74]. The vertical dotted lines tag the inner turning points of the incoming continuum wave function-in the entrance channel-with the respective points in the exit channel and the transition dipole moment magnitude at that position. p c k J J v D R J J J v D R J ( ) 8 3

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Section: Introductionmentioning

confidence: 99%

Formation of molecular ions by radiative association of cold trapped atoms and ions

et al. 2015

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“…First experiments in such setups studied elastic and reactive two-body collisions (e.g. [7][8][9][10][11][12][13][14]). In accordance with the well-known Langevin theory, the corresponding reactive rates were measured to be independent of the collision energy [8,10].…”

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Energy Scaling of Cold Atom-Atom-Ion Three-Body Recombination

et al. 2016

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We study three-body recombination of Ba + + Rb + Rb in the mK regime where a single 138 Ba + ion in a Paul trap is immersed into a cloud of ultracold 87 Rb atoms. We measure the energy dependence of the three-body rate coefficient k3 and compare the results to the theoretical prediction, k3 ∝ E −3/4 col where E col is the collision energy. We find agreement if we assume that the non-thermal ion energy distribution is determined by at least two different micro-motion induced energy scales. Furthermore, using classical trajectory calculations we predict how the median binding energy of the formed molecules scales with the collision energy. Our studies give new insights into the kinetics of an ion immersed into an ultracold atom cloud and yield important prospects for atom-ion experiments targeting the s-wave regime.When three atoms collide, a diatomic molecule can form in a three-body recombination (TBR) process. In cold neutral atomic gases, TBR was investigated for spinpolarized hydrogen as well as alkalis (see e.g. [1][2][3]). In the context of Bose-Einstein condensation, TBR plays a crucial role as a main loss mechanism. By now, the scaling of TBR as a function of collision energy and scattering lengths in neutral ultracold gases has been investigated in detail [4]. When considering TBR in atom-ion systems, one can expect three-body interactions to be more pronounced due to the underlying longer-range r −4 polarization potential. Energy scaling of TBR in charged gases was studied at temperatures down to a few K, especially for hydrogen and helium due to their relevance in plasmas and astrophysics (e.g. [5,6]). Depending on the studied temperature range a variety of power laws was found but not a common threshold law. The recent development of novel hybrid traps for both laser cooled atoms and ions has opened the possibility to investigate cold atom-ion interactions and chemical reactions in the mK-regime and below. First experiments in such setups studied elastic and reactive two-body collisions (e.g. [7][8][9][10][11][12][13][14]). In accordance with the well-known Langevin theory, the corresponding reactive rates were measured to be independent of the collision energy [8,10]. Very recently we predicted a theoretical threshold law on the scaling properties for cold atom-atom-ion three-body collisions [15]. Understanding the scaling of reaction rates with quantities such as the collision energy is crucial for fundamentally understanding TBR and for the prospects of the experimental realization of ultracold s-wave atom-ion collisions. Furthermore, as we will show here, studying TBR allows for insights into the kinetics of an ion immersed in a cloud of atoms. This letter reports on the combined theoretical and experimental investigation of the energy scaling of threebody atom-atom-ion collisions in the mK regime. We measure the TBR rate coefficient k 3 of Ba + in an ultracold Rb cloud as a function of the mean collision energy of the ion, E col , which we control via the excess micromotion (eMM) of the Paul trap...

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“…The majority of the studies performed so far focused on studying sympathetic cooling of the ions by the atoms [133,134,131,127,137] and chemical processes between the cold ions and the atoms [128,119,138,126,139,140,141]. See Refs.…”

Section: Translationally Cold Ion-molecule Collisionsmentioning

confidence: 99%

“…[130,45,1] for a detailed discussion of the working principle of a MOT. Apart from MOTs, [121,122,128,126,127,131,132], ion traps have also been combined with magnetic or optical dipole traps which allow the preparation of even colder samples of atoms down to temperatures of hundreds of nK [133,134,135].…”

Section: Translationally Cold Ion-molecule Collisionsmentioning

confidence: 99%

Chemistry With Controlled Ions

Willitsch

2017

Advances in Chemical Physics

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Evidence of sympathetic cooling of Na+ions by a Na magneto-optical trap in a hybrid trap

Cited by 61 publications

References 58 publications

Formation of molecular ions by radiative association of cold trapped atoms and ions

Formation of molecular ions by radiative association of cold trapped atoms and ions

Energy Scaling of Cold Atom-Atom-Ion Three-Body Recombination

Chemistry With Controlled Ions

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