Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Hauser, Daniel; Lakhmanskaya, Olga; Lee, Seung–Hyun; Roučka, Štěpán; Wester, Roland

doi:10.1088/1367-2630/17/7/075013

Cited by 10 publications

(10 citation statements)

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“…We find three-body rate coefficients below 10 –30 cm 6 /s for the measured temperature range. This is much smaller than previously measured three-body rate coefficients for OH – with H 2 or Cl – with CH 3 Cl, which can be attributed to the smaller density of internal states in the transient Cl – (H 2 ) complex prior to stabilization. It also shows the sensitivity of ion–molecule kinetics measurements in cryogenic ion traps.…”

Section: Resultscontrasting

confidence: 67%

Complex Formation in Three-Body Reactions of Cl^– with H₂

et al. 2021

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Three-body reaction rates of Cl– with H2 to form the weakly bound complex Cl–(H2) are measured between 10 and 26 K in a linear radio-frequency wire trap. Formation of larger clusters of the form Cl–(H2)2 are also observed. The three-body (or termolecular) rate coefficients follow the form aT –1, with a = 1.12(2) × 10–29 cm6 K s–1. Reverse reactions to repopulate the Cl– parent ion were measured, even though the binding energy of the complex makes bimolecular dissociative collisions energetically inaccessible at low temperatures. The back-reaction was found to be proportional to the cube of the hydrogen density, suggesting that the dissociation mechanism depends on multiple collisions. Comparisons of the rate coefficients measured in a 16-pole wire trap and a 22-pole trap demonstrate significantly lower ion temperatures in the wire trap.

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Section: Resultscontrasting

confidence: 67%

Complex Formation in Three-Body Reactions of Cl^– with H₂

et al. 2021

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“…(Mulin et al, 2015) observed isotope exchange in cold reactions of OH − with D 2 and of OD − with H 2 . (Hauser et al, 2015a) investigated complex formation and internal proton-transfer of OH − +H 2 complexes at low temperature.…”

Section: E Cold Chemistrymentioning

confidence: 99%

Cold hybrid ion-atom systems

et al. 2019

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Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper reviews the theoretical and experimental progress in research on cold hybrid ion-atom systems which aim to combine the best features of the two well-established fields. We provide a broad overview of the theoretical description of ion-atom mixtures and their applications, and report on advances in experiments with ions trapped in Paul or dipole traps overlapped with a cloud of cold atoms, and with ions directly produced in a Bose-Einstein condensate. We start with microscopic models describing the electronic structure, interactions, and collisional physics of ion-atom systems at low and ultralow temperatures, including radiative and non-radiative charge transfer processes and their control with magnetically tunable Feshbach resonances. Then we describe the relevant experimental techniques and the intrinsic properties of hybrid systems. In particular, we discuss the impact of the micromotion of ions in Paul traps on ion-atom hybrid systems. Next, we review recent proposals for using ions immersed in ultracold gases for studying cold collisions, chemistry, many-body physics, quantum simulation, and quantum computation and their experimental realizations. In the last part we focus on the formation of molecular ions via spontaneous radiative association, photoassociation, magnetoassociation, and sympathetic cooling. We discuss applications and prospects of cold molecular ions for cold controlled chemistry and precision spectroscopy.

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“…The collisions of OH − molecular anions with ultracold Rb atoms were studied both experimentally [31,32] and theoretically [32][33][34][35][36]. The cooling of simple molecular ions such as MgH + , NH − 2 , and OH − immersed in cold buffer gases of helium or molecular hydrogen were also experimentally [23,[37][38][39][40][41] and theoretically [42][43][44] investigated. Unfortunately, there is very little knowledge of cold and ultracold interactions, collisions, and reactions between polyatomic molecular ions and alkali-metal or alkalineearth-metal atoms at the moment, hence prospects for sympathetic cooling of polyatomic molecular ions down to low and ultralow temperatures are not known.…”

Section: Introductionmentioning

confidence: 99%

Cold interactions and chemical reactions of linear polyatomic anions with alkali-metal and alkaline-earth-metal atoms

Tomza

2017

Phys. Chem. Chem. Phys.

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We consider collisional studies of linear polyatomic ions immersed in ultracold atomic gases and investigate the intermolecular interactions and chemical reactions of several molecular anions (OH − , CN − , NCO − , C2H − , C4H − ) with alkali-metal (Li, Na, K, Rb, Cs) and alkaline-earth-metal (Mg, Ca, Sr, Ba) atoms. State-of-the-art ab initio techniques are applied to compute the potential energy surfaces (PESs) for these systems. The coupled cluster method restricted to single, double, and noniterative triple excitations, CCSD(T), is employed and the scalar relativistic effects in heavier metal atoms are modeled within the small-core energy-consistent pseudopotentials. The leading long-range isotropic and anisotropic induction and dispersion interaction coefficients are obtained within the perturbation theory. The PESs are characterized in detail and their universal similarities typical for systems dominated by the induction interaction are discussed. The two-dimensional PESs are provided for selected systems and can be employed in scattering calculations. The possible channels of chemical reactions and their control are analyzed based on the energetics of reactants. The present study of the electronic structure is the first step towards the evaluation of prospects for sympathetic cooling and controlled chemistry of linear polyatomic ions with ultracold atoms.

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Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Cited by 10 publications

References 50 publications

Complex Formation in Three-Body Reactions of Cl^– with H₂

Complex Formation in Three-Body Reactions of Cl^– with H₂

Cold hybrid ion-atom systems

Cold interactions and chemical reactions of linear polyatomic anions with alkali-metal and alkaline-earth-metal atoms

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Complex formation and internal proton-transfer of hydroxyl-hydrogen anion complexes at low temperature

Cited by 10 publications

References 50 publications

Complex Formation in Three-Body Reactions of Cl– with H2

Complex Formation in Three-Body Reactions of Cl– with H2

Cold hybrid ion-atom systems

Cold interactions and chemical reactions of linear polyatomic anions with alkali-metal and alkaline-earth-metal atoms

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Product

Resources

About

Complex Formation in Three-Body Reactions of Cl^– with H₂

Complex Formation in Three-Body Reactions of Cl^– with H₂