State-to-state chemistry for three-body recombination in an ultracold rubidium gas

Wolf, Joschka; Deiß, Markus; Krükow, Artjom; Tiemann, E.; Ruzic, Brandon P.; Wang, Yujun; D'Incao, Jose; Julienne, Paul S.; Denschlag, Johannes Hecker

doi:10.1126/science.aan8721

Cited by 80 publications

(105 citation statements)

References 41 publications

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“…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]. Cold molecular ions can also be produced by the ionization of ultracold molecules [34][35][36] or by sympathetic cooling of molecular ions from higher temperature [37,38].…”

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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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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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“…Directly after its ionization the molecule is trapped in a Paul trap [23] which is centered on the atomic cloud. Subsequently, the micromotion-driven ion elastically collides with ultracold atoms [12,24]. This leads to loss of atoms from the shallow dipole trap which is measured by absorption imaging.…”

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Hyperfine Magnetic Substate Resolved State-to-State Chemistry

2019

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We extend state-to-state chemistry to a realm where besides vibrational, rotational and hyperfine quantum states magnetic quantum numbers are also resolved. For this, we make use of the Zeeman effect which energetically splits levels of different magnetic quantum numbers. The chemical reaction which we choose to study is three-body recombination in an ultracold quantum gas of 87 Rb atoms forming weakly-bound Rb2 molecules. Here, we find the propensity rule that the total mF quantum number of the two atoms forming the molecule is conserved. Our method can be employed for many other reactions and inelastic collisions and will allow for novel insights into few-body processes.

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“…The Paul trap is centered on the optical dipole trap so that the ions are immersed in the atom cloud. The ions inflict loss on the atom cloud (iii) [31,32], which we measure via absorption imaging. Thus, by detecting atom loss, we infer the production of Rydberg molecules.…”

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Observation of spin-orbit-dependent electron scattering using long-range Rydberg molecules

Deiß

Haze

Wolf

et al. 2020

Phys. Rev. Research

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We present experimental evidence for spin-orbit interaction of an electron as it scatters from a neutral atom. The scattering process takes place within a Rb 2 ultralong-range Rydberg molecule, consisting of a Rydberg atomic core, a Rydberg electron and a ground state atom. The spin-orbit interaction leads to characteristic level splittings of vibrational molecular lines which we directly observe via photoassociation spectroscopy. We benefit from the fact that molecular states dominated by resonant p-wave interaction are particularly sensitive to the spin-orbit interaction. Our work paves the way for studying novel spin dynamics in ultralong-range Rydberg molecules. Furthermore, it shows that the molecular setup can serve as a micro laboratory to perform precise scattering experiments in the low-energy regime of a few meV.

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State-to-state chemistry for three-body recombination in an ultracold rubidium gas

Cited by 80 publications

References 41 publications

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

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

Hyperfine Magnetic Substate Resolved State-to-State Chemistry

Observation of spin-orbit-dependent electron scattering using long-range Rydberg molecules

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