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MS: Fachverband Massenspektrometrie

MS 8: Multi-Reflection Time-of-Flight Spectrometers

MS 8.3: Vortrag

Donnerstag, 17. März 2022, 11:15–11:30, MS-H9

Improving a multi-reflection time-of-flight mass spectrometer with multiple active voltage-stabilization loops — •Paul Fischer¹, Paul Florian Giesel¹, Frank Wienholtz², and Lutz Schweikhard¹ — ¹Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany — ²Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

The principal observable in multi-reflection time-of-flight mass spectrometry (MR-ToF MS)—a stored ion species’ lapping period between two electrostatic mirrors—is most stable over long measurement times when the MR-ToF analyzer’s potential configuration is as constant as possible. By stabilizing the most sensitive mirror potential with an active feedback loop, long-term resolving powers can be significantly increased, as has been demonstrated recently [1].

Based on this concept, the Greifswald MR-ToF mass spectrometer is equipped with subsequent stabilization loops for multiple mirror potentials [2]. Isobaric species of atomic clusters are used to probe the subsequent gain in MR-ToF performance and characterize different-quality hardware for the implementation of the active voltage controller. The system shows improved long-term mass resolving power, settling behavior for different experimental cycles, and better conditions for the timing of pulsed in-trap photoexcitation of atomic clusters.

[1] Wienholtz et al., Nucl. Instrum. Meth. B 463:348 (2020)

[2] Fischer et al., Rev. Sci. Instrum. 92:063203 (2021)