16 documents found

Article / Chapter
2010

Single azopyridine-substituted porphyrin molecules for configurational...

A new azopyridine functionalized Ni–porphyrin was synthesized as a model compound for deposition and switch on surfaces. Two geometrically and electronically different states of single molecules on Au(111) were found by scanning tunneling microscopy/ spectroscopy and analyzed with density functional...
London: Royal Society of Chemistry, 2010
Dissertation

Exploiting Spin Manipulation and Stereo-Isomerization in Molecular Switches

The thesis deals with issues relating to the response of individual molecules to charge injection, investigated using a low-temperature Scanning Tunneling Microscope.
Dissertation

An Electrospray Ion Source for Ultra-High Vacuum Deposition of Organic...

During the course of this thesis a new instrument for the deposition of ions, produced by electrospray ionization, under ultra–high vacuum conditions was designed, assembled, and put into operation. The deposition techniques available under ultra–high vacuum conditions can usually not be applied to molecules...
Dissertation

Exploring structural, electronic, magnetic, and vibrational properties...

In this thesis spin-resolved and spin-integrated scanning tunneling microscopy (STM) and spectroscopy (STS) are used to explore structural, electronic, magnetic, and vibrational properties of nanostructures on surfaces. STS of the differential conductance is performed at constant current and at...
Dissertation

Scanning Tunneling Spectroscopy of Pb Thin Films

The present thesis deals with the electronic structure, work function and single-atom contact conductance of Pb thin films, investigated with a low-temperature scanning tunneling microscope. The electronic structure of Pb(111) thin films on Ag(111) surfaces is investigated using scanning tunneling spectroscopy...
Dissertation

Atomic and Molecular Manipulation with a Scanning Tunneling Microscope

In this thesis structural, electronic, chemical properties and dynamic processes of adsorbed nanostructures on metal surfaces are investigated with a low-temperature scanning tunneling microscope (STM).
Dissertation

Scanning tunneling microscopy and spectroscopy of functional molecules...

This thesis is committed to the study of functional molecules adsorbed on metal surfaces by means of Low Temperature Scanning Tunneling Microscopy. It includes two main parts. In the first part the adsorption geometry of lander molecule (C90H98) on different metal surfaces is discussed. Three conformations...
Dissertation

Scanning-tunneling-microscope investigations on Rb exposed TaS2 and light...

Two different aspects of surface science were analyzed in this thesis. First, the light emission properties of single crystal silicon with different orientations and doping were studied using the scanning tunneling microscope. Tunneling electrons excite several optical transitions in silicon bulk. The...
Dissertation

Metals and organic adsorbates on GaAs(110) : a scanning tunneling microscopy,...

Surface plasmon polaritons of the tip of a scanning tunneling microscope are used to induce fluorescence from tetraphenylporphine molecules on GaAs(110) surfaces at very low coverages. Light spectra exhibiting vibrationally resolved Q-band transitions reveal that the luminescence is of molecular origin....
Dissertation

Magnetoresistance of atomic structures studied with a Scanning Tunneling...

In this thesis spin-dependent properties of adsorbates placed in different magnetic environments are investigated using a low-temperature scanning tunneling microscope. Spin-polarized currents and anisotropic magnetoresistance (AMR) are studied for single atoms and atomic structures adsorbed on a ferro- magnetic...
Dissertation

Shot noise measurements at single atom contacts in a low-temperature scanning...

A setup to measure shot noise at atomic contacts in a scanning tunnelling microscope is described. Shot noise measurements were performed at contacts to single Au, Fe and Co atoms on a Au(111) surface. Contacts to some of the Fe and Co atoms showed indications of a spin-polarisation of the transport...
Dissertation

Scanning tunneling and atomic force microscopy of molecular switches

This thesis revolves around the investigation of molecules adsorbed on metallic surfaces using combined low temperature scanning tunneling microscopy (STM) and atomic force microscopy (AFM). The focus is on three studies addressing switching and adsorption phenomena as well as acting forces in molecular...
Dissertation

Scanning tunneling microscopy of cobalt and iron complexes on metal surfaces

In this thesis, structural, magnetic and electronic properties of different classes of transition metal complexes are studied by means of low-temperature scanning tunneling microscopy. Electrospray ionization is used for the deposition of theselarge molecules on metal surfaces. Four different experiments...
Dissertation

Scanning Tunneling Studies on Patterned Noble Metal (111) Substrates

This thesis comprises low temperature UHV STM and STS experiments. Firstly, the electronic structure of decorated Ag(111) surfaces is explored, with focus on quasielectron lifetimes in Shockley surface states, made accessible by constructing monatomically deep hexagonal and triangular surface vacancies,...
Dissertation

Aufbau eines Ultrahochvakuum-Tieftemperatur-Rastertunnelmikroskops

In dieser Arbeit werden die Entwicklung, der Aufbau und die Inbetriebnahme eines Tieftemperatur-Rastertunnelmikroskops vorgestellt, welches unter Ultrahochvakuumbedingungen betrieben wird.
Dissertation

Light Emission from Multi-Electron Processes in the Scanning Tunneling...

Light emission from noble metal junctions in a scanning tunneling microscope (STM) was investigated. The main subtopics are the determination of the local electronic temperature at the STM junction and light emission from multi-electron processes. A normalization scheme was derived in this thesis, based...