Ismael Catovic October 4, 2013 Preparing an Ultraviolet Photoelectron Spectroscopic Instrument for Characterization of Plasma-Facing Materials Ismael Catovic October 4, 2013

Surface Science Group Koel Research Group specializes in surface science Research: Characterize surfaces Understand fundamental chemical interactions at a surface Heterogeneous Catalysis Photocatalysts for solar cells Plasma-facing components

PPPL primary goal: “developing the scientific understanding and key innovations needed to realize fusion as an energy source for the world.”

Auger spectroscopy Basic parts: Electron gun Electron detector Analyzer Typically use electrons in 50 eV to 3 keV range Works via core-valence-valence transition Surface sensitive (escape depth of electrons is a few nanometers). Used for detecting atoms on the surface of a material.

Dirty Molybdenum Species Coverage Mo 18% O 82%

After Dosing 1 ML Lithium Species Coverage Mo 3% O 66% LiO 31%

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UV Photoelectron Spectroscopy (UPS) Basic Parts: Ultraviolet light source Electron detector Electron Analyzer Light typically has energy in range of tens of eV Excites valence electrons Surface sensitive (escape depth of emitted electrons is a few nanometers) Sensitivity of <1 eV Molecular detector

Project Outline: Inventory UPS instrument Sketch instrument for future duplication (detailed) Repair instrument Assemble materials needed to operate instrument Test and operate instrument

Home-built ups instrument

Home-built ups instrument

Quartz Discharge Lamp

Reflections

Thank You Princeton Environmental Institute Koel Research Group Prof. Bruce Koel Dr. Coleman Kronawitter Jie Fu (PhD Student) Dr. Angela Capece