Calibration of parent and fragment ion detection rates in Rosettas ROSINA/DFMS mass spectrometer

De Keyser, J.; Gibbons, A.; Dhooghe, F.; Altwegg, Kathrin; Balsiger, Hans; Berthelier, J.-J.; Fuselier, S.A.; Gombosi, T.I.; Neefs, E.; Rubin, Martin (2019). Calibration of parent and fragment ion detection rates in Rosettas ROSINA/DFMS mass spectrometer. International journal of mass spectrometry, 446, p. 116233. Elsevier 10.1016/j.ijms.2019.116233

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The Double Focusing Mass Spectrometer DFMS embarked on the European Space Agency’s Rosetta mission as part of the ROSINA instrument suite. It boasts a high mass resolution and a high sensitivity, which have guaranteed spectacular discoveries during Rosetta’s rendez-vous with comet 67P/Churyumov-Gerasimenko. This paper describes the DFMS data calibration procedure for determining the parent and fragment ion count rates in the neutral mode, which serve as the basis for retrieving the neutral gas densities. A new approach to computing secondary electron yields is presented. Attention is given to an analysis of the mass peak shapes, which change with magnet temperature. Discrete counting statistical effects also affect the peak shape at low counts. If not accounted for, changes of mass peak shape can induce errors of up to 20% on the determination of the ion fluxes. An assessment of the different sources of uncertainty on the obtained count rates and ratios of count rates is presented.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Altwegg, Kathrin; Balsiger, Hans and Rubin, Martin

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

1387-3806

Publisher:

Elsevier

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

04 Feb 2020 16:09

Last Modified:

09 Feb 2020 02:46

Publisher DOI:

10.1016/j.ijms.2019.116233

BORIS DOI:

10.7892/boris.139314

URI:

https://boris.unibe.ch/id/eprint/139314

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