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Atomic scale imaging, manipulation, and spectroscopy

 

Atomic scale imaging, manipulation, and spectroscopy Mechanical and electrical properties of molecules in self-assembled films Ambient pressure photoelectron spectroscopy for environnemental sciences Studies of friction, adhesion, and wear at the nanometer scale Electronic, mechanical, and chemical properties of nanoclusters Structure of thin liquid films and wetting Nanoscale material imaging and manipulation (Molecular Foundry) Catalytic and chemical properties of surfaces

 

 

 

 

Updated by Sabine, July 4 2008

 

Variable temperature ultra-high vacuum STM

The system combines the power of scanning tunneling microscopy (STM) with the capability to control sample temperature in an ultrahigh vacuum (UHV) environment. UHV is important for the preparation of clean, well-characterised metal surfaces. Molecules and atoms are adsorbed from the gas phase and studied by STM. Temperature below ambient (as low as 35 K) restrict adsorbate mobility and can bring the timescale of processes of interest into the range accessible to STM (seconds to minutes).

 

POSTDOC: Franck Rose
STUDENTS: Mous Tatarkhanov
Former Researchers: Evgeny Fomin, Mark Rose, Toshiyuki Mitsui

 

For details about the apparatus, see Equipment
For details about the results, see:

 

NEW:

The Nature of the Dissociation Sites of Hydrogen Molecules on Ru(001)

 

Active sites for hydrogen dissociation on Pd(111)

Tip induced diffusion of water molecules

Initial stage of Pd(111) wetting

Subsurface impurities in Pd(111) studied by STM

 

Single Molecule Spectroscopy using low temperature UHV STM/DFM

Two low temperature (LT) ultrahigh vacuum (UHV) scanning tunneling and dynamic force microscopes (STM/DFM) are being constructed to perform both microscopy (STM/DFM) and spectroscopy (STS/DFS). The first system is under test experiments, and the second is still under construction. The most prominent design goal is to achieve the highest stability and optimum space resolution in order to perform electronic, vibrational, and force spectroscopy at individually selected and targeted molecules adsorbed on suitable substrates.

 

POSTDOC: Byoung Choi, Sabine Maier
STUDENTS: Tomoko Shimizu, Ingeborg Stass
Former Researchers:Aitor Mugarza

 

For details about the apparatus, see Equipment

 

We have tested the performance in STM mode on several surfaces. Here are some images that we got!

 

Electron standing wave (Friedel Oscillation) on Cu(111)

(2x2)-Oxygen/Ru(0001); center and right images are taken at the same place with different tunneling conditions.

 
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