Laboratory for Electron Spectroscopy and Surface Analysis (LESSA)

The Laboratory for Electron Spectroscopy and Surface Analysis (LESSA) is a part (along with the Clean Room and the Keck nano-imaging center) of the Department of Chemistry and Biochemistry facility cluster for surface science, thin films studies, and nano-scale characterization. Our mission is to provide analytical and educational services to the department and university on the preparation, modification, and study of solid surfaces. A diverse array of commercial and custom capabilities are employed for film growth and analysis are performed on an upgraded Kratos 165 Ultra Photoelectron Spectrometer.

Kratos 165 Ultra Photoelectron Spectrometer

  • The Ultra has capabilites for Mg and Al x-ray excitation and has a high sensitivity Al monochromatic source.
  • There is also a SPECS 10/35 high-intensity UV sourve (HeI and HeII) for low energy valence band studies of solids.
  • The spectrometer uses an intensified microchannel plate/Delay Line detector to for increased count rate with up to 127 individual counting channels. This allows for both spectral and imaging measurement using the same detector for x-ray source powers up to 300 watts
  • The Ultra also uses a unique magnetic and electrostatic lens combination in conjunction with a separate mirror analyzer to effect real time chemical state imaging. Spatial resolutions as low as 10 microns can be attained.
  • The system also has capabilities for sputter depth profiling, sample heating and cooling, and fast introduction into the ultra high vacuum environment.
  • The system is interfaced to and controlled by a PC based computer running ax X-win unix emulation to Run the Kratos Vision2 suite of Acquisition and data analysis capabilities.