Photoelectron spectroscopy (1.6)

electron configuration

electrons exist in “shell(energy levels)” and subshells(sublevels)”

outer electrons are valence electrons

Aufbau Principle

means “to build up”

electrons fill lower energy levels first and then higher ones

is determined by photoelectron spectroscopy

photoelectron spectroscopy (PES)

determines the relative energies of electrons in atoms/ions

use radiation to remove an electron form an atom

valance(outer) electrons are easier to remove than core(inner) electrons

photoelectron spectroscopy process

1)Irradiation: Sample is exposed to high-energy photons (usually X-rays or UV light).

2)Photoejection: Electrons are ejected from the sample's outermost energy levels.

3)Detection: Energies of emitted electrons are measured and analyzed.

photoelectron spectroscopy peaks

correspond to different energy levels of electrons in an atom

the position and intensity of the peaks can be used to differentiate between different elements

take note

rewatch the second ap daily 1.6 video for VERY helpful example problems!!!!

Binding energy

the energy needed to KEEP an electron in an atom (different from ionization energy which is the energy needed to REMOVE an electron)