[Zurück]

R. Wilhelm, J. Schwestka, E. Gruber, R. Heller, R. Kozubek, M. Schleberger, S. Facsko, F. Aumayr:
"Radiative and non-radiative de-excitation of slow highly charged ions transmitted through freestanding single layer graphene";
in: "Proc. of the XXIII International Conference on Ion-Surface Interactions (ISI-2017), editors: E.Yu. Zykova, P.A. Karaseov, A.I. Titov, V.E. Yurasovam, 21.-25.08.2015, Moscow, Russia", Vol.2; National Research University Higher School of Economics, 2017, S. 24 - 26.

Slow highly charged ions interacting with a solid surface undergo an ultrafast charge
exchange combined with a rapid electronic de-excitation within less than 10 fs [1, 2]. These
processes involve capture of some 10 electrons, emission of at least some 10 additional
electrons from the surface and radiative as well as non-radiative de-excitation of the ion. To
investigate the branching ratio of radiative vs. non-radiative de-excitation we measured x-ray
emission of highly charged Ar ions with two, one or no K-shell hole(s) when they are
transmitted through a freestanding single layer of graphene. To discriminate x-ray emission
from ions impacting on the sample holder or the graphene support grid structure we use a
coincidence technique where ions are measured after transmission in a channeltron.