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Article
The reactivity of gold and platinum metals in their cluster phase
Platinum surfaces are known to be among the most active ones for the oxidation of carbon monoxide, whereas gold surfaces are completely inert for this reaction. The question remains: Do small clusters of these...
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Article
Size-selected Agn and Cun clusters supported on MgO(100) films
Small Ag n (n≤13) and Cu n (n≤7) clusters, generated by sputtering with a new ultrahigh vacuum (UHV)-compatible Xe-ion gun and size-selected b...
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Article
Surface-state linewidth from scanning tunnelling spectroscopy
The STM can be used to investigate lifetimes of hot holes in a surface state at low temperatures. We analysed dI/dV data from Ag(111) using detailed tunnelling calculations and a simple model and found an electro...
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Article
Stability of two-dimensional nanostructures
We investigate atomic and molecular nanostructures on metal surfaces by variable low-temperature scanning tunnelling microscopy. In combination with molecular dynamics calculations we achieve a detailed unders...
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Chapter and Conference Paper
Size-selected Agn and Cun clusters supported on MgO(100) films
Small Ag n (n ≤ 13) and Cu n (n ≤ 7) clusters, generated by sputtering with a new ultrahigh vacuum (UHV)-compatible Xe-ion gun and size-selected by a ...
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Chapter and Conference Paper
The reactivity of gold and platinum metals in their cluster phase
Platinum surfaces are known to he among the moss active ones for the oxidation of carbon monoxide, whereas gold surfaces are completely inert for this reacticsr. The question remains: Do small clusters of thes...
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Article
Size-dependent light emission from mass-selected clusters
The emission of photons in the visible wavelength range from mass-selected Ag+ n, Cu+ n, Pt+ n and Pd+ n ( ) clusters is observed. Photons are detected ...
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Article
Analysis of spectroscopic scanning tunneling microscope images
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Article
Low-temperature manipulation of Ag atoms and clusters on a Ag(110) surface
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Article
Photoemission and scanning tunneling experiments with small particles on solid surfaces
The fascination of research with nanometersized objects in contact with a macroscopic surface will be illustrated by two examples: mass-selected supported transition-metal clusters and C60 molecules on metallic s...
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Article
Photon emission from adsorbed C60 molecules with sub-nanometer lateral resolution
We present the first experimental demonstration of spatially resolved photon emission of individual molecules on a surface. A scanning tunneling microscope (STM) was used as a local electron source to excite p...
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Article
Internal structure of C60 fullerence molecules as revealed by low-temperature STM
We have performed Scanning Tunneling Microscopy (STM) in ultra-high vacuum at low temperatures (5 and 50K) of unordered and ordered C60 layers adsorbed on a Au(110) surface. STM topographs of the frozen C60 molec...
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Article
Surface effects in Dy, DySb and DyTe observed by photoelectron spectroscopy
Cold condensed (100 K) Dy-films, as well as DySb and DyTe were studied by photoelectron spectroscopy using HeII and HeII* excitation sources. The spectra were analyzed using the relative intensities and energy sp...
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Article
Photoemission study of the electronic structure of size-selected transition metal clusters deposited on Ag(110)
We report on a photoemission study (XPS, UPS) of the evolution of the electronic structure with cluster size of Nin, Pdn, Ptn(n=1–15) mass-selected clusters deposited in submonolayer quantities on a Ag(110) singl...
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Chapter
High-Resolution Photoemission Study of the Low-Energy Excitations Reflecting the Superconducting State of Bi-Sr-Ca-Cu-O Single Crystals
uv-photoemission spectra (hv=21. 2 eV) of single-crystal specimens of the high-Tc, superconductor Bi2Sr2CaCu 2O8 have been measured with a resolution of 20 meV in the normal state at 105 K and in the superconduct...
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Chapter
Electronic Structure of Deposited Mass-Selected Pt Clusters on Silver Films
The knowledge of electronic structure as a function of cluster size is crucial for the understanding of many properties of condensed matter at the nanometer scale such as the metal-insulator transition, the be...
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Chapter
Photoemission from Size-Selected Pt-Clusters Deposited on Silver Films
When atoms are brought close together to form a solid their outer wave functions overlap and the energy levels of the individual atoms broaden and become the energy bands of condensed matter. The observation o...
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Chapter
Observation of Low-Energy Excitations in Lanthanide Materials by High-Resolution Photoemission
One of the fundamental motivations for electron spectroscopic studies is to deduce ground state properties of electronic systems from their excitation spectra. Among the high-energy spectroscopies photoemissio...
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Chapter
Photoelectron Spectroscopic Observation of the Density of Low-Lying Excitations in Ce-Solids
When atoms are brought close to one another the overlap of their outer charge densities will give rise to bond and band formation of condensed matter. A unique situation is encountered in the lanthanides where...
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Article
The penetration parameter λ of the anomalousM1-conversion of the 482 keV transition in181Ta
Byγ- e K − ande K ...