Haan, Rutger (2022) Analysis of ion energies by means of a Retarding Field Analyzer and a first application to charge exchange in He(2+)-H2 collisions. Bachelor's Thesis, Applied Physics.
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Abstract
In this thesis the question whether compact retarding field analyzers can be used to measure ion energy distributions, was explored. Experiments have been performed where the mean current was measured as a function of the voltage on the retarding grids of the Retarding Field Analyzer (RFA), on the ions 4 keV H+, 8 keV He2+ and 12 keV Sn3+. Moreover, first charge exchange measurements were performed for the He2+ in the presence of 1 mL min−1 flow of H2 gas. These measurements were performed in order to determine the resolution of the RFA as well as measure the percentage of He2+ that absorbed an electron from the H2 gas. The resolution of the RFA resulting from the H+ experiments was found to be 1.03 ± 0.10%, the He2+ experiments were found to be 1.26 ± 0.06%. The He+ ions, produced by charge exchange, showed a resolution of 2.21 ± 0.35%, the apparent reduction of the resolution might be due to some broadening of the ion’s stemming from their charge changing collisions with H2 . Furthermore, when the currents of He2+ and He+ were compared, the percentage of He2+ ions that reacted with H2 gas could be determined. It was found that 2.53 ± 0.02% of He2+ ions have exchanged their charge with H2 gas. Lastly, the resolution of the RFA was calculated from the Sn3+ experiments. It was found that the resolution was 0.98 ± 0.19%. The resolutions resulting from the different ions are in good agreement with each other and thus boosts the confidence in a ’true’ resolution of the RFA, that is found to be around 1%.
| Item Type: | Thesis (Bachelor's Thesis) |
|---|---|
| Supervisor name: | Hoekstra, R.A. and Schlatholter, T.A. and Bijlsma, K.I.J. |
| Degree programme: | Applied Physics |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 12 Jul 2022 14:36 |
| Last Modified: | 19 Jul 2022 10:22 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/27466 |
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