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A: Atomphysik

A 14: Poster

A 14.33: Poster

Donnerstag, 18. März 1999, 16:30–19:00, PY

Broadening of hydrogenic levels near thin metallic films — •Uwe Thumm¹, Peter Kuerpick², and Uwe Wille³ — ¹J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506 — ²SAP, Neurottstr. 16, D-69190 Walldorf — ³Bereich Theoretische Physik, Hahn–Meitner Institute, D-14091 Berlin

We evaluated the width of resonantly broadened hydrogenic

levels in the vicinity of thin metallic films in first–order

perturbation theory. We calculate the electronic states of the

film as eigenstates of a Jennings-type (LDA) potential.

In order to include hybridization effects, we represent

the hydrogenic levels in a parabolic (Stark) basis.

The widths show characteristic, sawtooth shaped, oscillations

as the film thickness is varied between 0.5 and 3 nm. These

oscillations are related to threshold effects in the onset

of resonant capture into a particular hydrogenic level.

We analyze the influence of these quantum size effects on

measurable parameters, such as electron capture probabilities

of slow incident hydrogenic ions.