Ion-kinetic-energy sampling in a 22-pole trap using ring-electrode evaporation
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| Format: | Preprint |
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2025
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| _version_ | 1866916588748275712 |
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| author | Jiménez-Redondo, Miguel Gerlich, Dieter Caselli, Paola Jusko, Pavol |
| author_facet | Jiménez-Redondo, Miguel Gerlich, Dieter Caselli, Paola Jusko, Pavol |
| contents | We present an experimental method for the characterization of the kinetic energies of ions confined in a 22-pole radio frequency trap by inducing a small potential barrier using the surrounding ring electrodes, allowing the selective extraction of ions. Energy sampling experiments have been performed on buffer gas thermalized He$^+$ ions at trap temperatures between 10-180 K, resulting in distinct extraction curves as a function of the potential barrier, and a differentiated behavior depending on the escape time from the trap. The experiments are complemented by Monte Carlo simulations of the ion trajectories inside the calculated trap potential and allow us to investigate the properties of the sampling method, the role of ion motion coupling, and the impact of residual buffer gas collisions on the observed results. The technique has also been successfully applied to identify energetic H$_3^+$ ions produced in an exothermic reaction inside the trap. Upon calibration, this method can provide relative kinetic energy distributions or be used to filter the maximum desired kinetic energy of the ions inside the trap. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_17530 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ion-kinetic-energy sampling in a 22-pole trap using ring-electrode evaporation Jiménez-Redondo, Miguel Gerlich, Dieter Caselli, Paola Jusko, Pavol Atomic Physics Astrophysics of Galaxies Chemical Physics We present an experimental method for the characterization of the kinetic energies of ions confined in a 22-pole radio frequency trap by inducing a small potential barrier using the surrounding ring electrodes, allowing the selective extraction of ions. Energy sampling experiments have been performed on buffer gas thermalized He$^+$ ions at trap temperatures between 10-180 K, resulting in distinct extraction curves as a function of the potential barrier, and a differentiated behavior depending on the escape time from the trap. The experiments are complemented by Monte Carlo simulations of the ion trajectories inside the calculated trap potential and allow us to investigate the properties of the sampling method, the role of ion motion coupling, and the impact of residual buffer gas collisions on the observed results. The technique has also been successfully applied to identify energetic H$_3^+$ ions produced in an exothermic reaction inside the trap. Upon calibration, this method can provide relative kinetic energy distributions or be used to filter the maximum desired kinetic energy of the ions inside the trap. |
| title | Ion-kinetic-energy sampling in a 22-pole trap using ring-electrode evaporation |
| topic | Atomic Physics Astrophysics of Galaxies Chemical Physics |
| url | https://arxiv.org/abs/2501.17530 |