1. X-ray Emission Spectroscopy
Cormac McGuinness
Physics Department
Trinity College Dublin
X-ray Emission Spectroscopy
Measure occupied bands in materials : organic semiconductors & transition metal oxides

2. X-ray Emission Process (Non-resonant)
2 p Valence Band
Remove electrons from 1s core level (continuum)
Hole is filled by electrons from the 2p band, emitting a photon
Energy of the emitted photon equals the energy difference between 1s and 2p bands
1 s Core Level

3. Copper Phthalocyanine
Localized probe
Photon in/Photon out spectroscopy
Photon energies ~ eV
Emission from the same excited atom (elemental probe)
Dipole selection rules:
l = ±1; s = 0; j = ±1, 0; mj = ±1, 0
(individual angular momentum resolved states)
Direct comparison with angular momentum resolved DOS calculations
Determine variations in the occupied states of similar materials

4. Soft X-ray spectrometer system

6. X-ray Emission Spectroscopy
Cormac McGuinness
Physics Department
Trinity College Dublin
X-ray Emission Spectroscopy
Resonant Inelastic X-ray Scattering (RIXS)