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Spectroscopic (RAIRS/XPS/TPD) system:

The system is equipped the following technics:

Reflexion-Absorption Infrared Spectroscopy (RAIRS): Allows analyzing the vibrations on the surface to determine the adsorption geometries of studied substrates. As by the selection rule, the vibrations which are parallel to the surface become invisible.

X-ray Photoelectron Spectroscopy (XPS): Allows a quantitative analysis of chemical elements in the first three layers of the sample surface.

Thermal Desorption Spectroscopy (TDS): Allows an analysis of fragments ejected from the surface during sample heating to follow the reactivity at the surface as a function of the temperature and / or to reconstitute the manner of a puzzle species to the surface.

STM/HREELS system:

High Resolution Electron Energy Loss Spectroscopy (HREELS): Allows an analysis of the vibrations on the surface to determine the different adsorption geometry of the studied substrates. Unlike RAIRS, this technique analyzes the dipoles parallel to the surface as well as low frequency vibration of bonds with the atoms of the surface.

Scanning Tunneling Microscope (STM): Produces the image of the substrate on an electrically conductive surface or only the surface with an intermolecular, even atomic resolution. Each pixel in the image is the average of a certain number of measurements of the height adjusted to maintain a constant current between the tip and the surface. The image shows a direct ‘‘view’’ of electronic cloud of atoms to determine the cleanliness of the surface, to estimate the coverage, to analyze the molecular interaction and to follow their movement.

STM system:

Scanning Tunneling Microscope (STM): Produces the image of the substrate on an electrically conductive surface or only the surface with an intermolecular, even atomic resolution. Each pixel in the image is the average of a certain number of measurements of the height adjusted to maintain a constant current between the tip and the surface. The image shows a direct ‘‘view’’ of electronic cloud of atoms to determine the cleanliness of the surface, to estimate the coverage, to analyze the molecular interaction and to follow their movement.

 

 

Chemistry Department - Peter McBreen's Laboratory - Surface Chemistry
1459, Pavillon Alexandre-Vachon - Québec (Québec) Canada G1K 7P4
Telephone : 418 656-3282 Fax : 418 656-7916 Email : peter.mcbreen@chm.ulaval.ca
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