X-ray Emission Spectroscopy

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Presentation transcript:

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

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

Copper Phthalocyanine Localized probe Photon in/Photon out spectroscopy Photon energies ~ 300-900 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

Soft X-ray spectrometer system

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