STATUS OF THE CHARATERIZATION PROGRAM AT ANL

Alexander Zinovev

LAPD Collaboration Meeting, October 15-16, 2009

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SCOPE OF CHARACTERIZATION

Secondary Electron Emission Yield (SY) vs. Electron Energy Photoemission Yield (PY) vs. Photon Density end Photon Energy

Parameters of Interest

Material Characterization

Chemical CompositionChemical States of Atoms on the SurfaceElectron Structure

MethodsX-ray Photoelectron Spectroscopy (XPS)Ultraviolet Photoelectron Spectroscopy (UPS)

SEE measurements

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Power SupplyPower Supply

target

collector

++

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SIMION Simulations of Electron Trajectories in LEED System

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3-D View of field distribution in LEED electrodes system

Photoelectron Yield Measurements

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Power SupplyPower Supply

target

collector

+-

Light

MonochromatorLight source

Telescope

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Schematic Design of the Instrument

Ion gunX-ray gun

Electron gun

Gate valve

Load-lock chamber

Spherical collector

Entrance of energy analyzer

Energy analyzer