Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals.

Diprose, Jake A, Richardson, Vincent, Regan, Paul, Roberts, Adam, Burdin, Sergey ORCID: 0000-0003-4831-4132, Tsikritea, Andriana, Mavrokoridis, Konstantinos ORCID: 0000-0002-9244-4519 and Heazlewood, Brianna R ORCID: 0000-0003-2073-4004 (2024) Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals. The journal of physical chemistry. A.

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Official URL: http://dx.doi.org/10.1021/acs.jpca.3c08132

Abstract

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 <i>in situ</i> 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.

Item Type:	Article
Uncontrolled Keywords:	Bioengineering
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	17 Apr 2024 08:59
Last Modified:	17 Apr 2024 09:00
DOI:	10.1021/acs.jpca.3c08132
Open Access URL:	https://doi.org/10.1021/acs.jpca.3c08132
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3180389