Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Theory and Modelling II
P 16.9: Vortrag
Mittwoch, 2. März 2016, 16:40–16:55, b302
Experimental determination of electron impact transfer rate coefficients between argon 1s states — •Emile Carbone1, Eddie van Veldhuizen2, Gerrit Kroesen2, and Nader Sadeghi1 — 1Univ. Grenoble Alpes, CNRS, CEA-Leti Minatec, LTM, F-38054 Grenoble Cedex, France — 2Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
Rather significant discrepancies between state of the art theoretical calculations and available experimental data have been observed over the years for electron impact transfer rates between excited states of noble gases. In this contribution, we present laser pump-probe experiments for the determination of the electron impact transfer rates between argon 1s metastable and resonant states [1, 2]. One 1s state is selectively depopulated by a nanosecond pulsed dye laser towards a 2p or 3p argon state. All four 1s states are measured by laser diode absorption spectroscopy while the electron density was determined by Thomson scattering. The analysis of the states densities relaxation following the laser perturbation allows us to provide a new set of rate coefficients for the losses of the 1s argon metastable states towards the 1s resonant states. Additionally, an important ion-core exchange term which goes between 1s2 and 1s4 states is measured. We confirm that the recent R-matrix theoretical calculations tend to underestimate the absolute values for the 1s transfer rates by electron impact.
[1] E. Carbone et al. J. Phys. D: Appl. Phys. (2013) 46 415202.
[2] E. Carbone et al. J. Phys. D: Appl. Phys. (2015) 48 425201.