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...