Reserach Support Services

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 SpectrometerThe 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.