Signature of metastable electrons in highly charged ion surface interactions

Details Signature of metastable electrons in highly charged ion surface interactions Signature of metastable electrons in highly charged ion surface interactions

1997-12-12

arxiv.org/abs/physics/9712021v3

Physics

Atomic Physics

12 pages, 3 figures, http://pikp28.uni-muenster.de/~ducree

Scientific paper

10.1103/PhysRevA.58.R1649

We present autoionization spectra of metastable Ar(8+) and C(4+), N(5+), O(6+) and Ne(8+) scattering off an Al(111) surface with incident energies down to 5 eV. The unprecedented quality of the experimental data permits the observation of a unique, yet undiscovered peak in the structures originating from the metastable projectiles compared to corresponding ground state configurations. Analyzing the peak positions for different projectile species and velocities we demonstrate that the peak must be ascribed to an above-surface transition under participation of the metastable state.

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