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Characterisation and modeling of a pulsed molecular beam

A. Lietard 1, 2 G. Gallician 1, 2 J. Tan 1, 2 M.-A. Gaveau 1, 2 M. Briant 1, 2 B. Soep 1, 2 J.-M. Mestdagh 1, 2 L. Poisson 1, 2
1 DyR - Dynamique Réactionnelle
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
2 LUMO - LUmière et MOlécules
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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https://hal-cea.archives-ouvertes.fr/cea-03053669
Contributor : Caroline Lebe Connect in order to contact the contributor
Submitted on : Wednesday, November 24, 2021 - 6:00:53 PM
Last modification on : Friday, November 26, 2021 - 3:42:20 AM

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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, pp.e1737743. ⟨10.1080/00268976.2020.1737743⟩. ⟨cea-03053669⟩

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