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

Silva, Humberto da; Raoult, Maurice; Aymar, M; Dulieu, Olivier

doi:10.1088/1367-2630/17/4/045015

Cited by 51 publications

(32 citation statements)

References 83 publications

(160 reference statements)

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“…Co-trapping ultra-cold atoms and cold ions offers new possibilities for exploring low-temperature collisions, that include phenomena such as s-wave scattering, Feshbach resonances [1], shape-resonances [2] and the creation of molecular ions [3]. In addition, it is also a promising platform for performing quantum computations [4], quantum simulations [5] and for studying out-of-equilibrium dynamics [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

et al. 2020

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Experiments in which ultra-cold neutral atoms and charged ions are overlapped, constitute a new field in atomic and molecular physics, with applications ranging from studying out-of-equilibrium dynamics to simulating quantum many-body systems. The holy grail of ion-neutral systems is reaching the quantum low-energy scattering regime, known as the s-wave scattering. However, in most atom-ion systems, there is a fundamental limit that prohibits reaching this regime. This limit arises from the time-dependent trapping potential of the ion, the Paul trap, which sets a lower collision energy limit which is higher than the s-wave energy. In this work, we studied both theoretically and experimentally, the way the Paul trap parameters affect the energy distribution of an ion that is immersed in a bath of ultra-cold atoms. Heating rates and energy distributions of the ion are calculated for various trap parameters by a molecular dynamics (MD) simulation that takes into account the attractive atom-ion potential. The deviation of the energy distribution from a thermal one is discussed. Using the MD simulation, the heating dynamics for different atom-ion combinations is also investigated. In addition, we performed measurements of the heating rates of a ground-state cooled 88 Sr + ion that is immersed in an ultra-cold cloud of 87 Rb atoms, over a wide range of trap parameters, and compare our results to the MD simulation. Both the simulation and the experiment reveal no significant change in the heating for different parameters of the trap. However, in the experiment a slightly higher global heating is observed, relative to the simulation.

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Section: Introductionmentioning

confidence: 99%

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

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. For higher atomic densities, the three-body processes resulting in the formation of molecular ions additionally play a role [21,32,33].…”

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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 fully quantum mechanical method for calculation of RCT is described in detail in Stancil & Zygelman (1996) and Zygelman & Dalgarno (1988) and for the radiative association in Zygelman & Dalgarno (1990), Zygelman et al (1998), andda Silva Jr et al (2015). Here we give only a brief outline.…”

Section: The Fully Quantum Mechanical Methodsmentioning

confidence: 99%

Radiative charge transfer and association in slow Li⁻+ H collisions

Lin

Peng

et al. 2017

A&A

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Aims. The radiative charge transfer and association processes in Li− + H collisions are studied in the 10 −10 −10 eV center-of-mass energy range. Methods. we carried out total and ν-resolved state-selective cross sections have been carried out by using the fully quantum, optical potential, and semiclassical methods. Results. In the energy region below ∼0.8 eV, the radiative association process is the dominant decay channel, while radiative charge transfer dominates at higher energies. Rich resonance structures are observed in the cross sections of both processes in the 0.1−1.5 eV energy range; These structures are associated with the quasi-bound states below the top of the centrifugal barrier of the effective potential in the entrance channel for specific vibrational and angular momentum states. It is found that with the increase of collision energy, the resonances occur for higher angular momentum states and lower vibrational states. Besides the cross sections for the studied processes we also present their reaction rate coefficients in the 10 −6 -10 6 K temperature range.

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

Cited by 51 publications

References 83 publications

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

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

Radiative charge transfer and association in slow Li⁻+ H collisions

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

Cited by 51 publications

References 83 publications

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

Effect of ion-trap parameters on energy distributions of ultra-cold atom–ion mixtures

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

Radiative charge transfer and association in slow Li−+ H collisions

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Radiative charge transfer and association in slow Li⁻+ H collisions