SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.10: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Design of a tandem mass spectrometer with ion trap to study particle nucleation under multicollisional conditions. — •Anastasiya Khramchenkova, Yihui Yan, and Jozef Lengyel — TUM School of Natural Sciences, Technical University of Munich, Garching, Germany

The goal of our research is to describe the essential molecular factors of one of the most critical atmospheric processes - the first steps of new particle formation. During aerosol formation, small clusters can grow and dissociate at any time, but only few reach the critical size at which further growth of the particle becomes spontaneous. However, the size and chemical composition of such critical nuclei have yet to be characterized, as there is currently no suitable analytical method. To this end, we are developing a tandem mass spectrometer for investigating particle nucleation at close to ambient pressures, combining precise control over cluster size with in situ real-time monitoring of complex kinetic analysis. The hydrated particles are generated by electrospray ionization, mass selected in a quadrupole mass filter, subsequently stored and exposed to precursor molecules in a ring electrode ion trap. After a variable storage time, an ion packet is extracted and focused into a perpendicularly mounted TOF MS, where the spectra are recorded with an MCP detector. Herein, we will discuss the instrumentation - design and implementation of each component. We will describe the characteristics of different RF ion guides, including stacked ring ion guides and multipoles, supplemented by ion trajectory simulations probed by the software package SIMION.