Volume 122, Issue 1, 01 January 2005
Index of content:
122(2005); http://dx.doi.org/10.1063/1.1842712View Description Hide Description
Artificial Au atomic chains with individual Pd impurities were assembled from single metal atoms with a scanning tunneling microscope on a NiAl(110) surface. Scanning tunnelingspectroscopy (STS) revealed an electronic resonance 2.15 eV above the Fermi energy localized within 4 Å of single Pd atom impurities and two electronic resonances 2.25 eV and 2.95 eV above the Fermi energy localized within 8 Å of Pd dimer impurities. The emergence of these localized resonances was studied by STS at each stage of the atom-by-atom assembly. Additionally, conductance images of the chains revealed delocalized electronic density oscillations in the pure Au segments of the chains.
122(2005); http://dx.doi.org/10.1063/1.1845411View Description Hide Description
Visible and near infrared extinctionspectra of goldnanorod regular arrays exhibit several bands assigned to high multipolar order plasmon resonances. These up to ninth order multipolar resonances generate surface enhanced Raman scatteringspectra with typically enhancement which is of similar magnitude as those obtained for dipolar excitations.