Atomic scale imaging, manipulation, and spectroscopy
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).
For details about the apparatus, see Equipment
NEW: The Nature of the Dissociation Sites of Hydrogen Molecules on Ru(001) (link to old site) Active sites for hydrogen dissociation on Pd(111) (link to old site) Tip induced diffusion of water molecules (link to old site) Initial stage of Pd(111) wetting (link to old site) Subsurface impurities in Pd(111) studied by STM (link to old site)
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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.
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!
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Electron standing wave (Friedel Oscillation) on Cu(111) |
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(2x2)-Oxygen/Ru(0001); center and right images are taken at the same place with different tunneling conditions. |