Journal article
Authors list: Miskun, Ivan; Dickel, Timo; San Andres, Samuel Ayet; Bergmann, Julian; Constantin, Paul; Ebert, Jens; Geissel, Hans; Greiner, Florian; Haettner, Emma; Hornung, Christine; Lippert, Wayne; Mardor, Israel; Moore, Iain; Plass, Wolfgang R.; Purushothaman, Sivaji; Rink, Ann-Kathrin; Reiter, Moritz P.; Scheidenberger, Christoph; Weick, Helmut
Publication year: 2021
Journal: International Journal of Mass Spectrometry
Volume number: 459
ISSN: 1387-3806
eISSN: 1873-2798
Open access status: Hybrid
DOI Link: https://doi.org/10.1016/j.ijms.2020.116450
Publisher: Elsevier
Abstract:
Gas-filled stopping cells are used at accelerator laboratories for the thermalization of high-energy radioactive ion beams. Common challenges of many stopping cells are a high molecular background of extracted ions and limitations of extraction efficiency due to space-charge effects. At the FRS Ion Catcher at GSI, a new technique for removal of ionized molecules prior to their extraction out of the stopping cell has been developed. This technique utilizes the RF carpet for the separation of atomic ions from molecular contaminant ions through their difference in ion mobility. Results from the successful implementation and test during an experiment with a 600 MeV/u Xe-124 primary beam are presented. Suppression of molecular contaminants by three orders of magnitude has been demonstrated. Essentially background-free measurement conditions with less than 1 % of background events within a mass-to charge range of 25 u/e have been achieved. The technique can also be used to reduce the space charge effects at the extraction nozzle and in the downstream beamline, thus ensuring high efficiency of ion transport and highly-accurate measurements under space-charge-free conditions. (C) 2020 The Author(s). Published by Elsevier B.V.
Citation Styles
Harvard Citation style: Miskun, I., Dickel, T., San Andres, S., Bergmann, J., Constantin, P., Ebert, J., et al. (2021) Separation of atomic and molecular ions by ion mobility with an RF carpet, International Journal of Mass Spectrometry, 459, Article 116450. https://doi.org/10.1016/j.ijms.2020.116450
APA Citation style: Miskun, I., Dickel, T., San Andres, S., Bergmann, J., Constantin, P., Ebert, J., Geissel, H., Greiner, F., Haettner, E., Hornung, C., Lippert, W., Mardor, I., Moore, I., Plass, W., Purushothaman, S., Rink, A., Reiter, M., Scheidenberger, C., & Weick, H. (2021). Separation of atomic and molecular ions by ion mobility with an RF carpet. International Journal of Mass Spectrometry. 459, Article 116450. https://doi.org/10.1016/j.ijms.2020.116450
Keywords
Beam purification; GAS CELL; Low-energy RIB; Molecular contamination; Space charge
