Broadening of hydrogenic levels near thin metallic films

U. Thumm
Kansas State University

P. Kuerpick
SAP, D-69190 Walldorf

U. Wille
Hahn--Meitner Institute, D-14091 Berlin

Abstract

We evaluate 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.

Supported by the Division of Chemical Sciences, Office of Basic Energy Sciences, Office of Energy Research, U.S. DOE

Submitted to the APS Centennial Meeting/DAMOP, Atlanta, GA in March 1999

 

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