Photoelectron Spectroscopy

1
Photoelectron Spectroscopy

• Lecture 7 instrumental details
• Electron detectors
• Instrumental examples

2
Electron Detectors
Channel Electron Multiplier
Microchannel Plate
CCD detectors can also be used, typically with a
phosphor screen to convert electrons to photons
3
Examples of Spectrometers
4
Gas-Phase Photoelectron Instrument
h?

Sample Chamber
Photon Source
Photon Induces the Photoelectric Effect.
Electrons are separated according to kinetic
energy
Output is plot of Ionization Energy vs. Counts

5
(No Transcript)
6
Surface Photoelectron Instrument
Sample Prep and Storage
Fast Entry
Main Analysis
7
(No Transcript)
8
Photoelectron Imaging Instrument
9
(No Transcript)
10
Mass-Selected Gas-Phase Photoelectron Instrument
MCP (mass detector)
Time-of-flight mass spectrometer
magnet
2.5 m
5x10-11 Torr
Time-of-flight magnetic botter photoelectron spect
rometer
4.0 m
Electrospray Ionization source
Z-stack MCP (photoelectron detector)
11
(No Transcript)