Development and characterization of high-repetition-rate sources for supersonic 
beams of fluorine radicals

Straňák, Patrik; Ploenes, Ludger; Hofsäss, Simon; Dulitz, Katrin; Stienkemeier, Frank; Willitsch, Stefan

doi:10.1063/5.0065498

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Development and characterization of high-repetition-rate sources for supersonic beams of fluorine radicals

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Hofsäss, Simon
Institute of Physics, University of Freiburg;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Straňák, P., Ploenes, L., Hofsäss, S., Dulitz, K., Stienkemeier, F., & Willitsch, S. (2021). Development and characterization of high-repetition-rate sources for supersonic beams of fluorine radicals. Review of Scientific Instruments, 92(10): 103203. doi:10.1063/5.0065498.

Cite as: https://hdl.handle.net/21.11116/0000-0009-66A9-6

Abstract

We present and compare two high-pressure, high-repetition-rate electric-discharge sources for the generation of supersonic beams of fluorine radicals. The sources are based on dielectric-barrier-discharge (DBD) and plate-discharge units attached to a pulsed solenoid valve. The corrosion-resistant discharge sources were operated with fluorine gas seeded in helium up to backing pressures as high as 30 bars. We employed a (3 + 1) resonance-enhanced multiphoton ionization combined with velocity-map imaging for the optimization, characterization, and comparison of the fluorine beams. Additionally, universal femtosecond-laser-ionization detection was used for the characterization of the discharge sources at experimental repetition rates up to 200 Hz. Our results show that the plate discharge is more efficient in F₂ dissociation than the DBD by a factor between 8 and 9, whereas the DBD produces internally colder fluorine radicals.