X-ray spectroscopic study of charge exchange phenomena in plasma-wall interaction
1 Institute of Physics, v.v.i., Academy of Sciences CR, 18221 Prague, Czech Republic
2 Czech Technical University in Prague, FNSPE, Prague, Czech Republic
3 Kohat University of Science and Technology, Kohat, Khyber Pakhtunkhwa, Pakistan
4 Université Pierre et Marie Curie UPMC and LULI, École Polytechnique, Paris, France
5 Physics Department, Auburn University, Auburn, AL, USA
a e-mail: firstname.lastname@example.org
Published online: 15 November 2013
Jets of energetic ions launched at laser-burnt-through foils represent an efficient tool for investigation of plasma interaction with solid surfaces (plasma-wall interaction, PWI) and for description of transient phenomena occurring close to the walls. Highly charged ions approaching the secondary target interpenetrate the near surface layer, collide with the counter-propagating matter and capture a large number of electrons. This results in a creation of atoms in highly excited Rydberg states or hollow ions with multiple inner vacancies; plasma jet and target ions may also undergo charge exchange (CE) processes. We report PWI experiments with Al/Si(PMMA) and Al/C targets irradiated at normal or oblique laser incidence. The distinct dip structures observed in red wings of Al Lyγ self-emission is interpreted in terms of CE between C6+ and Al12+ in the near-wall zone. The spectroscopic identification of CE phenomena is supported by results of analytical and numerical calculations.
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