Characterization of a seeded pulsed molecular beam using the velocity map imaging technique

Lietard A. (1, 2) , Poisson L. (2, 3) , Mestdagh J.M. (2, 3) , Gaveau M.A. (2, 3)

1 Korea University [Seoul]
2 LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
3 DyR - Dynamique Réactionnelle

An experimental study has been performed to characterize the density and the velocity distribution in a pulsed molecular beam generated by a source associating a pulsed valve and an oven placed just downstream. In its operating mode, the flow is alternatively in a supersonic and effusive regime. The Velocity Map Imaging (VMI) technique associated with laser ionization allows measuring the velocity distribution and the density of molecules as a function of time during the expansion. It gives us a very precise insight into the structure of the molecule bunch, and therefore into the nature of the expansion from which the molecular beam is extracted.

Keywords: Flow visualization; Velocity measurement; Atomic and molecular beam sources; Ionization; Ionizing radiation

Domains: Chemical Sciences; Theoretical and/or physical chemistry

Lietard A., Poisson L., Mestdagh J.M., Gaveau M.A.. Characterization of a seeded pulsed molecular beam using the velocity map imaging technique . AIP Conference Proceedings, 2017, 1786, pp.060004-1-060004-6. ⟨10.1063/1.4967576⟩. ⟨cea-01401343⟩