Conformational and state-specific effects in reactions of 2,3-dibromobutadiene with Coulomb-crystallized calcium ions

Kilaj, Ardita; Käser, Silvan; Wang, Jia; Stran̆ák, Patrik; Schwilk, Max; Xu, Lei; Lilienfeld, O. Anatole von; Küpper, Jochen; Meuwly, Markus; Willitsch, Stefan

doi:10.1039/d3cp01416a

Cited by 4 publications

(2 citation statements)

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“…The population in each of the electronic states can be manipulated to examine the state dependence of reactions of neutral molecules with laser-cooled ions. This technique has been demonstrated in ion traps with a variety of laser-cooled ionic species. ,,− This includes two examples studied within our own group: the quantum-state-resolved study of Ca + with O 2 and NO . The Ca + + NO reaction involved two product states with a discernible dependence of the P 1/2 state population.…”

Section: Doppler Cooling and Quantum-state Dependent Reactionsmentioning

confidence: 99%

Cold Ion–Molecule Reactions in the Extreme Environment of a Coulomb Crystal

Krohn,

Lewandowski

2024

J. Phys. Chem. A

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Coulomb crystals provide a unique environment in which to study ion-neutral gas-phase reactions. In these cold, trapped ensembles, we are able to study the kinetics and dynamics of small molecular systems. These measurements have connections to chemistry in the Interstellar Medium (ISM) and planetary atmospheres. This Feature Article will describe recent work in our laboratory that uses Coulomb crystals to study translationally cold, ion-neutral reactions. We provide a description of how the various affordances of our experimental system allow for detailed studies of the reaction mechanisms and the corresponding products. In particular, we will describe quantum-state resolved reactions, isomer-dependent reactions, and reactions with a rarely studied, astrophysically relevant ion, CCl + .

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Section: Doppler Cooling and Quantum-state Dependent Reactionsmentioning

confidence: 99%

Cold Ion–Molecule Reactions in the Extreme Environment of a Coulomb Crystal

Krohn,

Lewandowski

2024

J. Phys. Chem. A

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“…The use of trapping and laser cooling methods to produce ensembles of translationally cold ions is an area of active research interest. Much of this interest is inspired by the diverse range of applications for cold, confined ionsincluding their use as qubits, , in the determination of fundamental constants, , for precision measurements, − and for the study of chemical reaction dynamics and kinetics. − As many ionic species of interest cannot be easily or efficiently laser-cooled, Coulomb crystals have emerged as a useful tool for the study of processes involving sympathetically cooled trapped ions.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals

Diprose,

Richardson,

Regan

et al. 2024

J. Phys. Chem. A

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Coulomb crystals have proven to be powerful and versatile tools for the study of ion−molecule reactions under cold and controlled conditions. Reactions in Coulomb crystals are typically monitored through a combination of in situ fluorescence imaging of the laser-cooled ions and destructive time-of-flight mass spectrometry measurements of the ejected ions. However, neither of these techniques is able to provide direct structural information on the positions of nonfluorescing "dark" ions within the crystal. In this work, structural information is obtained using a phosphor screen and a microchannel plate detector in conjunction with a Timepix3 camera. The Timepix3 camera simultaneously records the spatial and temporal distribution of all ions that strike the phosphor screen detector following crystal ejection at a selected reaction time. A direct comparison can be made between the observed Timepix3 ion distributions and the distributions established from SIMION simulations of the ion trajectories through the apparatus and onto the detector. Quantitative agreement is found between the measured Timepix3 signal and the properties of Coulomb crystals assigned using fluorescence imaging�independently confirming that the positions and numbers of nonfluorescing ions within Coulomb crystals can be accurately determined using molecular dynamics simulations. It is anticipated that the combination of high-resolution spatial and temporal data will facilitate new measurements of the ion properties within Coulomb crystals.

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