H. Jensen

Unoccupied states of individual silver clusters and chains on Ag(111)

Size-selected silver clusters on Ag(111) were fabricated with the tip of a scanning tunneling microscope. Unoccupied electron resonances give rise to image contrast and spectral features which shift toward the Fermi level with increasing cluster size. Linear assemblies exhibit higher resonance energies than equally sized compact assemblies. Density functional calculations reproduce the observed energies within

Conductance of tip–surface and tip–atom junctions on Au(111) explored by a scanning tunnelling microscope

0.6\phantom{\rule{0.3em}{0ex}}\mathrm{eV}

Phase coherence length and quantum interference patterns at step edges

and enable an assignment of the resonances to hybridized atomic

Stark effect in Au ( 111 ) and Cu ( 111 ) surface states

5s

Self-organization of cobalt-phthalocyanine on a vicinal gold surface revealed by scanning tunnelling microscopy

and

Molecular orbital shift of perylenetetracarboxylic-dianhydride on gold

5{p}_{z}

Surface state electron dynamics of clean and adsorbate-covered metal surfaces studied with the scanning tunnelling microscope

orbitals with silver substrate states.

Electron dynamics in vacancy islands: Scanning tunneling spectroscopy on Ag(111)

The conductance between the tip of a scanning tunnelling microscope and a Au(111) surface is measured at tip–surface distances comprising tunnelling and contact regions. Contact between the tip and the flat sample surface as well as between the tip and an individual gold atom can be performed reproducibly without deteriorating the imaging capability of the instrument. Measurements performed on the face-centred cubic and hexagonal close-packed stacking domains of the Au(111) surface reconstruction lead to similar conductances of one quantum of conductance at contact.

Resonator design for use in scanning tunneling spectroscopy studies of surface electron lifetimes

A Comment on the Letter by P. Wahl et al., Phys. Rev. Lett. 91, 106802 (2003). The authors of the Letter offer a Reply.

Dynamics of surface-localised electronic excitations studied with the scanning tunnelling microscope

We present a low-temperature scanning tunneling spectroscopy study of the Au(111) and of the Cu(111) surface states showing that their binding energy increases when the tip is approached towards the surface. This result, supported by a one-dimensional model calculation and by a comparison to existing photoemission spectroscopy measurements, confirms the existence of a tip-induced Stark effect as previously reported for Ag(111) [L. Limot et al., Phys. Rev. Lett. 91, 196801 (2003)], and suggests that this effect is a general feature of scanning tunneling spectroscopy.