Direct Visualization of Au Atoms Bound to TiO2(110) O-Vacancies

Direct Visualization of Au Atoms Bound to TiO2(110) O-Vacancies

Au nanoparticles supported on reducible metal oxide surfaces are known to be active catalysts for a number of reactions including CO oxidation and hydrogen production. The exact choice of a metal oxide support has been shown to have a marked impact on activity, suggesting that interactions between Au and the support play a key role in catalysis. For TiO2, a model substrate for Au catalysis, it ...

Direct imaging of single Au atoms within GaAs nanowires.

Incorporation of catalyst atoms during the growth process of semiconductor nanowires reduces the electron mean free path and degrades their electronic properties. Aberration-corrected scanning transmission electron microscopy (STEM) is now capable of directly imaging single Au atoms within the dense matrix of a GaAs crystal, by slightly tilting the GaAs lattice planes with respect to the incide...

Bound states of interacting helium atoms

It is known that most of the paradoxes of modern microscopic theory of superfluidity [1] have to do with the commonly accepted assumption of the single-particle Bose condensate (SBC) prevailing in the quantum structure of the superfluid component. In the He Bose liquid, because of strong interaction, the SBC is strongly suppressed (it comprises no more than 10% of all He atoms [2]), consequentl...

Chiral dynamics of deeply bound pionic atoms.

We present and discuss a systematic calculation, based on two-loop chiral perturbation theory, of the pion-nuclear s-wave optical potential. A proper treatment of the explicit energy dependence of the off-shell pion self-energy together with (electromagnetic) gauge invariance of the Klein-Gordon equation turns out to be crucial. Accurate data for the binding energies and widths of the 1s and 2p...

Direct visualization of quasi-ordered oxygen chain structures on Au(110)-(1×2)