Silver dimers were fabricated on Ag(111) by single-atom manipulation using the tip of a cryogenic scanning tunnelling microscope. An unoccupied electronic resonance was observed to shift toward the Fermi level with decreasing atom-atom distance as monitored by spatially resolved scanning tunnelling spectroscopy. Density functional calculations were used to analyse the experimental observations and revealed that the coupling between the adsorbed atoms is predominantly direct rather than indirect via the Ag(111) substrate.
@article{arxiv.0903.5186,
title = {Evolution of unoccupied resonance during the synthesis of a silver dimer on Ag(111)},
author = {Alexander Sperl and Joerg Kroeger and Richard Berndt and Andreas Franke and Eckhard Pehlke},
journal= {arXiv preprint arXiv:0903.5186},
year = {2015}
}