Document Type

Article

Publication Version

Published Version

Publication Date

1996

Journal or Book Title

Langmuir

Volume

12

Issue

14

First Page

3472

Last Page

3480

DOI

10.1021/la950211v

Abstract

We have investigated the structures of CF3I, and its dissociation products, adsorbed on Ru(001) using low-energy electron diffraction and electron-stimulated desorption ion angular distribution (ESDIAD). Atomic iodine forms (√3x√3)R30° islands even at very low coverages. At 70% of saturation and above, a (2X2) superstructure forms which we attribute to a p(2X2) unit cell with one CF3 group and one iodine atom. ESDIAD images show F+ desorbing at normal emission and in three hexagonal patterns. The normal emission is attributed to a tilted configuration of CF3(ad) in which one C-F bond is oriented perpendicular to the surface. A small hexagon is attributed to F(ad) on step edges. A large hexagon at low coverages may arise from isolated CF3(ad) species possessing C3v symmetry. And finally, an intermediate hexagon is attributed to perturbation of the CF3(ad) orientation by molecular fragments which result from electron irradiation of physisorbed CF3I.

Comments

Reprinted (adapted) with permission from Langmuir 12 (1996): 3472, doi: 10.1021/la950211v. Copyright 1996 American Chemical Society..

Copyright Owner

American Chemical society

Language

en

File Format

application/pdf

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