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Type: Artigo de periódico
Title: Pressure-induced physical changes of noble gases implanted in highly stressed amorphous carbon films
Author: Lacerda, RG
dos Santos, MC
Tessler, LR
Hammer, P
Alvarez, F
Marques, FC
Abstract: Noble gases (Ar, Kr, and Xe) were trapped in an amorphous carbon matrix in the 1-11-GPa pressure range. Extended and near-edge x-ray-absorption spectroscopies indicate clustering of noble gases induced by the host matrix internal pressure. Simultaneously, the matrix pressure promotes a shift of the noble-gas core-level binding energy of similar to1 eV. The Auger parameter reveals that both the initial state and the host relaxation terms contribute to the binding-energy shift. Ab initio calculations performed on an Ar-7 cluster and on Ar atoms clustered in aromatic molecules support the experimental findings.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.68.054104
Date Issue: 2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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