Transcript Ismael Catovic _sm

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
150
100
Intensity
50
0
0
100
200
300
400
-50
-100
-150
-200
Energy (eV)
Species
Mo
O
Coverage
18%
82%
500
600
After Dosing 1 ML Lithium
100
50
Intensity
0
0
50
100
150
200
250
300
350
400
-50
-100
-150
-200
Energy (eV)
Species
Mo
O
LiO
Coverage
3%
66%
31%
450
500
550
600
Need More Information
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