Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Atom incorporation at edge defects in clusters.

Shi Cai Wang1, Gert Ehrlich

  • 1Coordinated Science Laboratory and Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Physical Review Letters
|November 5, 2004
PubMed
Summary

Theoretical models suggested surface cluster defects lower atom incorporation energy. However, field ion microscopy experiments on iridium (Ir) atoms on iridium clusters revealed defects do not offer lower energy paths; incorporation occurs at straight steps.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Asymmetric one-dimensional random walks.

The Journal of chemical physics·2008
Same author

Long jumps in surface diffusion.

Journal of colloid and interface science·2004
Same author

Long jump rates in surface diffusion: W on W(110).

Physical review letters·2004
Same author

Non-nearest-neighbor jumps in 2D diffusion: Pd on W(110).

Physical review letters·2002

Area of Science:

  • Surface science
  • Atomic clusters
  • Materials science

Background:

  • Theoretical models predict lower energy barriers for atom incorporation at surface cluster edge defects compared to straight steps.
  • Experimental validation of these theoretical predictions regarding atom incorporation pathways on surface clusters is limited.

Purpose of the Study:

  • To experimentally investigate the role of edge defects in the incorporation of atoms onto surface clusters.
  • To compare atom incorporation behavior at defect sites versus straight steps on iridium clusters.

Main Methods:

  • Field ion microscopy (FIM) was employed to observe the behavior of individual iridium (Ir) atoms.
  • Experiments were conducted on various sizes of Ir(111) clusters (Ir18, Ir19, Ir20, Ir55, Ir63), both with and without edge defects.

Related Experiment Videos

Main Results:

  • Experimental observations contradicted theoretical predictions.
  • Edge defects on the iridium clusters did not exhibit significantly lower energy paths for atom incorporation.
  • Atom incorporation predominantly occurred at straight step edges of the clusters.

Conclusions:

  • The study's findings challenge existing theoretical models regarding the influence of defects on atom incorporation.
  • Straight step edges appear to be the primary sites for atom incorporation on these iridium clusters, not defect sites.