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Characterisation and modeling of a pulsed molecular beam

A. Lietard 1 G. Gallician 1 J. Tan 1 M.-A. Gaveau 1 M. Briant 1 B. Soep 1 J.-M. Mestdagh 1 L. Poisson 1
1 DyR - Dynamique Réactionnelle
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : Standard techniques used in real-time reaction dynamics experiments, namely photoionization by a pulsed laser and velocity imaging are applied to document the time dependent velocity distribution of 2-hydroxypyridine (2-HP) molecules in a pulsed beam where 2-HP is seeded in either helium or argon. The purpose is to identify features which cannot be assigned to a pure free molecular (effusive in the present case) or a pure continuum (supersonic here) flow regime. The beam is generated in a two stage expansion, where the first stage is driven by a pulsed valve. The experimental work is complemented by simulations. Two phenomena retain the attention: (i) a slow return to the effusive flow regime after the valve opening has generated an intense supersonic flow; (ii) development of a shock wave a short time after the valve opening.
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Submitted on : Friday, December 11, 2020 - 10:23:41 AM
Last modification on : Saturday, May 1, 2021 - 3:51:39 AM



A. Lietard, G. Gallician, J. Tan, M.-A. Gaveau, M. Briant, et al.. Characterisation and modeling of a pulsed molecular beam. Molecular Physics, Taylor & Francis, 2021, 119 (1-2), ⟨10.1080/00268976.2020.1737743⟩. ⟨cea-03053669⟩



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