Optical theorem and the inversion of cross section data for atom scattering from defects on surfaces

D. A. Hamburger*, R. B. Gerber

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The information content and properties of the cross section for atom scattering from a defect on a flat surface are investigated. Using the Sudden approximation, a simple expression is obtained that relates the cross section to the underlying atom/defect interaction potential. An approximate inversion formula is given, that determines the shape function of the defect from the scattering data. Another inversion formula approximately determines the potential due to a weak corrugation in the case of substitutional disorder. An optical theorem, derived in the framework of the Sudden approximation, plays a central role in deriving the equations that conveniently relate the interaction potential to the cross section. Also essential for the result is the equivalence of the operational definition for the cross section for scattering by a defect, given by Poelsema and Comsa, and the formal definition from quantum scattering theory. This equivalence is established here. The inversion result is applied to determine the shape function of an Ag atom on Pt(111) from scattering data.

Original languageEnglish
Pages (from-to)6919-6930
Number of pages12
JournalThe Journal of Chemical Physics
Volume102
Issue number17
DOIs
StatePublished - 1995

Fingerprint

Dive into the research topics of 'Optical theorem and the inversion of cross section data for atom scattering from defects on surfaces'. Together they form a unique fingerprint.

Cite this