Accession Number : ADA251414

Title :   Relaxation at High-Index Surfaces Studied by Atomic-Resolution Scanning Tunneling Microscopy: Au(311), (533) and (221) Electrochemical Interfaces.

Descriptive Note : Technical rept.,

Corporate Author : PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY

Personal Author(s) : Gao, X. ; Hamelin, A. ; Weaver, M. J.

Report Date : MAY 1992

Pagination or Media Count : 18

Abstract : Atomic relaxation at the stepped surfaces Au(311), (533), and (221) in aqueous solution is examined by atomic-resolution scanning tunneling microscopy (STM). The former two surfaces yield ordered (1 x 1) domains at electrode potentials corresponding to near-zero or positive electronic charges. Substantial surface relaxation is observed, however, at more negative potentials, featuring displacements of the step edge and neighboring atomic rows. The Au(221) surface exhibits a marked relaxation at positive as well as negative electronic charges. The so-far underutilized value of STM for exploring atomic structure at stepped surfaces is demonstrated by these findings.

Descriptors :   *ATOMIC STRUCTURE, *RELAXATION, *RESOLUTION, *SCANNING, *TUNNELING, *MICROSCOPY, *GOLD, *ELECTROCHEMISTRY, *INTERFACES, EDGES, ELECTRODES, ELECTRONICS, STRUCTURES, SURFACES, VALUE, YIELD.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE