title: Transport of ground-state hydrogen atoms in a plasma expansion.
abstract: The transport of ground-state atomic hydrogen in the expansion of a thermal plasma generated from an Ar-H2 mixture is studied by means of laser-based diagnostic techniques. The flow of hydrogen atoms is investigated by two-photon excitation laser-induced fluorescence (LIF), whereas Ar atoms are probed by LIF as well as by UV Rayleigh scattering. The transport of Ar atoms can be fully understood in terms of a free jet flow; H atoms on the contrary exhibit an anomalous behavior. In the course of the plasma expansion, hydrogen atoms decouple from the argon fluid by a diffusion process as a direct consequence of recombination of H atoms at the vessel walls. In this contribution it is shown, on the basis of experimental results, how plasma-surface interactions can strongly influence the flow pattern of an atomic radical fluid.
authors.forename: S
authors.initials: S
authors.lastname: Mazouffre
authors.forename: M G
authors.initials: MG
authors.lastname: Boogaarts
authors.forename: I S
authors.initials: IS
authors.lastname: Bakker
authors.forename: P
authors.initials: P
authors.lastname: Vankan
authors.forename: R
authors.initials: R
authors.lastname: Engeln
authors.forename: D C
authors.initials: DC
authors.lastname: Schram