Spin-controlled atom–ion chemistry

Sikorsky, Tomas; Meir, Ziv; Ben-shlomi, Ruti; Akerman, Nitzan; Ozeri, Roee

doi:10.1038/s41467-018-03373-y

Cited by 76 publications

(62 citation statements)

References 31 publications

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“…Now that we cooled the mixture close to the s-wave limit we expect the atom-ion interactions to be governed by quantum mechanics. To look for signs of quantum behavior in the interaction we investigate the occurrence of spin-changing collisions [7,10,29] as a function of collision energy. Spin-exchange is associated with short-range collisions between the atoms and ions, known as Langevin collisions.…”

Section: Tionmentioning

confidence: 99%

Buffer gas cooling of a trapped ion to the quantum regime

et al. 2020

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Great advances in precision quantum measurement have been achieved with trapped ions and atomic gases at the lowest possible temperatures [1-3]. These successes have inspired ideas to merge the two systems [4]. In this way one can study the unique properties of ionic impurities inside a quantum fluid [5][6][7][8][9][10][11] or explore buffer gas cooling of the trapped ion quantum computer [12]. Remarkably, in spite of its importance, experiments with atom-ion mixtures remained firmly confined to the classical collision regime [13]. We report a collision energy of 1.15(0.23) times the s-wave energy (or 9.9(2.0) µK) for a trapped ytterbium ion in an ultracold lithium gas. We observed a deviation from classical Langevin theory by studying the spin-exchange dynamics, indicating quantum behavior in the atom-ion collisions. Our results open up numerous opportunities, such as the exploration of atom-ion Feshbach resonances [14,15], in analogy to neutral systems [16].

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Section: Tionmentioning

confidence: 99%

Buffer gas cooling of a trapped ion to the quantum regime

et al. 2020

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“…Cold hybrid ion-atom experiments can be used to realize and investigate cold collisions [13,20,23], controlled chemical reactions [24,25], charge and spin transfer dynamics [18,26], quantum simulation [27], and quantum computation [28]. In such systems, diatomic molecular ions can be produced via spontaneous or stimulated charge-transfer radiative association or photoassociation [29,30], however, only RbCa + [10,15], RbBa + [31], CaYb + [12], CaBa + [11] molecular ions have * michal.tomza@fuw.edu.pl been observed as products of cold collisions between respective ions and atoms.…”

mentioning

confidence: 99%

Interactions and chemical reactions in ionic alkali-metal and alkaline-earth-metal diatomic AB+ and triatomic A2B+ systems

Śmiałkowski

Tomza

2020

Phys. Rev. A

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We theoretically characterize interactions, energetics, and chemical reaction paths in ionic twobody and three-body systems of alkali-metal and alkaline-earth-metal atoms in the context of modern experiments with cold hybrid ion-atom mixtures. Using ab initio techniques of quantum chemistry such as the coupled-cluster method, we calculate ground-state electronic properties of all diatomic AB + and most of triatomic A2B + molecular ions consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, and Yb atoms. Different geometries and wave-function symmetries of the ground state are found for different classes of molecular ions. We analyze intermolecular interactions in the investigated systems including additive two-body and nonadditive three-body ones. As an example we provide twodimensional interaction potential energy surfaces for KRb + +K and Rb + +Sr2 mixtures. We identify possible channels of chemical reactions based on the energetics of the reactants. The present results may be useful for investigating controlled chemical reactions and other applications of molecular ions formed in cold hybrid ion-atom systems.

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“…The long range interaction between neutral atoms and ions 41 scales as 1/r 4 . The details of the long range potential and hence the charge exchange probabilities varies with the combination of atoms and ions [15][16][17][18] . We observe for the first time the charge exchange interaction between 39 and 40 Ca + ions.…”

Section: Resultsmentioning

confidence: 99%

“…The very recent research in this field focuses on controlling the chemical reactions in cold ion-atom collisions. These include controlling the electronic state 16,17 , the spin state 18 or the collision energy 17,19 . The long interrogation time and precise internal state control make these systems an ideal platform to explore quantum state dependent interactions.…”

Section: Introductionmentioning

confidence: 99%

A hybrid ion-atom trap with integrated high resolution mass spectrometer

Jyothi

Egodapitiya

Bondurant

et al. 2019

Review of Scientific Instruments

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In this article we describe the design, construction and implementation of our ion-atom hybrid system incorporating a high resolution time of flight mass spectrometer (TOFMS). Potassium atoms ( 39 K) in a Magneto Optical Trap (MOT) and laser cooled calcium ions ( 40 Ca + ) in a linear Paul trap are spatially overlapped and the combined trap is integrated with a TOFMS for radial extraction and detection of reaction products. We also present some experimental results showing interactions between 39 K + and 39 K, 40 Ca + and 39 K + as well as 40 Ca + and 39 K pairs. Finally, we discuss prospects for cooling CaH + molecular ions in the hybrid ion-atom system.

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Spin-controlled atom–ion chemistry

Cited by 76 publications

References 31 publications

Buffer gas cooling of a trapped ion to the quantum regime

Buffer gas cooling of a trapped ion to the quantum regime

Interactions and chemical reactions in ionic alkali-metal and alkaline-earth-metal diatomic AB+ and triatomic A2B+ systems

A hybrid ion-atom trap with integrated high resolution mass spectrometer

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