Investigation of the wideband mass accuracy of an MRTOF spectrometer

Widera, Dominika (2025) Investigation of the wideband mass accuracy of an MRTOF spectrometer. Bachelor's Thesis, Physics.

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Abstract

This thesis investigates the wideband mass accuracy of the Multi-Reflection Time-of-Flight Mass Spectrometer (MRTOF-MS) at the RIKEN Nishina Center, focusing on systematic uncertainties. A source of curium-248 (Cm-248) is used to study the spectrometer’s precision across a broad mass-to- charge range (A/q = 44–133). Rubidium-85 (Rb-85) is used as mass reference mass, while calibration of the spectrometer’s offset time is performed once using caesium-133 (Cs-133). Calibration with Cs- 133 yielded an optimal time offset of 195.6 nanoseconds, whera the relative mass deviations remained consistently within ±2.1 × 10−6 for most ion species, when the same offset time was used for all measurements. The lighter ions with mass-to-charge ratio (A/q = 44-75) have been found to exhibit larger discrepancies in accuracy as they are further away from the reference ion. Purified ion spectra of a chosen mass number have been obtained using the in-MRTOF deflector method. The capability of the MRTOF-MS to identify species in broad-band mode is confirmed. The study is basis for a further improvement, as it clarifies the order of magnitude of a previously expected but uncertain problem. Suggestions for future work are advanced calibration techniques, improved field stability, and real-time correction algorithms.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Even, J.
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	15 Jul 2025 11:34
Last Modified:	15 Jul 2025 11:34
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/36052

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