X-ray Photoelectron Spectroscopy
XPS is a surface sensitive analytical technique. Briefly, it measures the binding energy of core electrons in the atoms of a sample by illuminating the sample with X-rays, and analysing the energy of the emitted photoelectrons.
It provides a quantitative analysis of the surface composition, and is sometimes called ESCA - electron spectroscopy for chemical analysis.
The binding energy (hence the energy of the detected photoelectrons) is also sensitive to the formal oxidation state of the atoms and the local chemical and physical environment.
It can also provide information about chemical composition as a function of depth within the sample (close to the surface).
Facilities Include:
VG Escalab 250, with monochromated or twin anode source.
Applications Include:
- Plastics and Polymers
- Optical and Electronic Devices
- Biomaterials
- Adhesion Chemistry
- Contaminants
- Characterisation of semi-conductors, catalysts