AP Chemistry / Unit 1: Atomic Structure and Properties
1.6 Photoelectron Spectroscopy
Notes
PES measures the energy needed to remove electrons from each subshell.
- Peaks farther left (higher binding energy) are closer to the nucleus.
- Peak height shows how many electrons are in that subshell.
Practice
In a PES spectrum, the peak with the highest binding energy comes from:
Innermost electrons.
A peak twice as tall as another means:
Height is proportional to electrons.
Neon's spectrum has three peaks with relative heights 2:2:6. These are:
$1s^22s^22p^6$.
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