Long-range versus short-range effects in cold molecular ion-neutral collisions

Dörfler, Alexander; Eberle, Pascal; Koner, Debasish; Tomza, Michał; Meuwly, Markus; Willitsch, Stefan

doi:10.1038/s41467-019-13218-x

Cited by 66 publications

(58 citation statements)

References 65 publications

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“…This complex cold reaction network is experimentally corroborated by looking at the relevance of different ionic species as a function of time [80]. Finally, we would like to point out that the role of external laser sources on few-body processes has also been observed in molecular ion-atom systems [11,95].…”

Section: The Role Of External Laser Sourcesmentioning

confidence: 61%

Cold chemistry: a few-body perspective on impurity physics of a single ion in an ultracold bath

Pérez‐Ríos

2021

Molecular Physics

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Impurity physics is a traditional topic in condensed matter physics that nowadays is being explored in the field of ultracold gases. Among the different classes of impurities, we focus on charged impurities in an ultracold bath. When a single ion is brought in contact with an ultracold gas, it is subjected to different reactive processes that can be understood from a cold chemistry perspective. In this work, we present an outlook of approaches for the dynamics of a single ion in a bath of ultracold atoms or molecules, complementing the usual many-body approaches characteristic of impurity physics within condensed matter physics. In particular, we focus on the evolution of a charged impurity in different baths, including external time-dependent trapping potentials, and explore the effect of the external laser sources present in ion-neutral hybrid traps on the reaction probability and evolution of an impurity.

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Section: The Role Of External Laser Sourcesmentioning

confidence: 61%

Cold chemistry: a few-body perspective on impurity physics of a single ion in an ultracold bath

Pérez‐Ríos

2021

Molecular Physics

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“…Very recently, Willitsch and co-workers identified a roaming-like reaction pathway in the charge exchange of N þ 2 with Rb 47 . The roaming-like mechanism observed in N þ 2 þ Rb involved the Rb atom orbiting around the central N 2 core of the reaction complex, undergoing several intramolecular collisions until the orientation and distribution of energy in the two moieties was such that the reaction could proceed to products 47 . A defining characteristic of roaming reaction pathways is the presence of long-range attractive forces in the reaction intermediate.…”

Section: Discussionmentioning

confidence: 99%

Strong inverse kinetic isotope effect observed in ammonia charge exchange reactions

et al. 2020

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Isotopic substitution has long been used to understand the detailed mechanisms of chemical reactions; normally the substitution of hydrogen by deuterium leads to a slower reaction. Here, we report our findings on the charge transfer collisions of cold Xe þ ions and two isotopologues of ammonia, NH 3 and ND 3. Deuterated ammonia is found to react more than three times faster than hydrogenated ammonia. Classical capture models are unable to account for this pronounced inverse kinetic isotope effect. Moreover, detailed ab initio calculations cannot identify any (energetically accessible) crossing points between the reactant and product potential energy surfaces, indicating that electron transfer is likely to be slow. The higher reactivity of ND 3 is attributed to the greater density of states (and therefore lifetime) of the deuterated reaction complex compared to the hydrogenated system. Our observations could provide valuable insight into possible mechanisms contributing to deuterium fractionation in the interstellar medium.

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“…The quantum control of isolated particles forms the basis for recent advancements in quantum computation 1 – 3 , for precise time and frequency measurements 4 , 5 , for searches for new physics beyond the standard model 6 , 7 , for controlled chemistry 8 – 10 and for quantum communication 11 , 12 .…”

Section: Introductionmentioning

confidence: 99%

Identification of molecular quantum states using phase-sensitive forces

Najafian¹,

Meir²,

Sinhal³

et al. 2020

Nat Commun

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Quantum-logic techniques used to manipulate quantum systems are now increasingly being applied to molecules. Previous experiments on single trapped diatomic species have enabled state detection with excellent fidelities and highly precise spectroscopic measurements. However, for complex molecules with a dense energy-level structure improved methods are necessary. Here, we demonstrate an enhanced quantum protocol for molecular state detection using state-dependent forces. Our approach is based on interfering a reference and a signal force applied to a single atomic and molecular ion. By changing the relative phase of the forces, we identify states embedded in a dense molecular energy-level structure and monitor state-to-state inelastic scattering processes. This method can also be used to exclude a large number of states in a single measurement when the initial state preparation is imperfect and information on the molecular properties is incomplete. While the present experiments focus on N$${}_{2}^{+}$$ 2 + , the method is general and is expected to be of particular benefit for polyatomic systems.

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Long-range versus short-range effects in cold molecular ion-neutral collisions

Cited by 66 publications

References 65 publications

Cold chemistry: a few-body perspective on impurity physics of a single ion in an ultracold bath

Cold chemistry: a few-body perspective on impurity physics of a single ion in an ultracold bath

Strong inverse kinetic isotope effect observed in ammonia charge exchange reactions

Identification of molecular quantum states using phase-sensitive forces

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