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

2. 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

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

4. 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.

5. Dirty Molybdenum
Species
Coverage Mo
18% O
82%

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

7. Need More Information

8. 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

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

10. Home-built ups instrument

11. Home-built ups instrument

12. Quartz Discharge Lamp

13. Reflections

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