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X-ray Emission Spectroscopy

Cormac McGuinness Cormac.McGuinness@tcd.ie Physics Department Trinity College Dublin. X-ray Emission Spectroscopy. Soft x-ray emission and resonant inelastic x-ray scattering of transition metal doped semiconductors. Project Summary.

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X-ray Emission Spectroscopy

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  1. Cormac McGuinness Cormac.McGuinness@tcd.ie Physics Department Trinity College Dublin X-ray Emission Spectroscopy • Soft x-ray emission and resonant inelastic x-ray scattering of transition metal doped semiconductors

  2. Project Summary • Study of electronic structure of transition metal-doped wide bandgap semiconductor oxide systems – i.e. magnetic semiconductors such as Co-ZnO and Co-SnO2 • Experimental & Theoretical • Measurements: (approximately 4-5 weeks beamtime per year) • SXE / XAS at: • O K (1s) edge –> O 2p states • Co L2,3 (2p) edge -> Co 3d, 4s states • RIXS measurements at: • O K (1s) edge –> O 2p -> Co 3d excitations • Co L2,3 (2p) edge -> Co 3d->3d excitations & Co 3d-> O 2p excitations • SXE/XMCD measurements • Measure element specific spin and orbital moments • Theoretical: • Modelling of metal 2p RIXS spectra using appropriate multiplet structure codes • Instrumentation: • Development of instrumentation for SXEXMCD measurements

  3. Core Level Spectroscopy Unoccupied states Fermi level Occupied states Core level Laser spectroscopy Excitations of valence electrons

  4. Photoelectron Spectroscopy

  5. X-ray Absorption Spectroscopy Dipole selection rule CrO2:

  6. X-ray Emission Spectroscopy Dipole selection rule CrO2:

  7. Resonant Inelastic X-ray Scattering Radiant resonant processes CaCu3Ti4O12: Ti 2p spectra

  8. Soft X-ray spectrometer system

  9. Project Summary • Study of electronic structure of transition metal-doped wide bandgap semiconductor oxide systems – i.e. magnetic semiconductors such as Co-ZnO and Co-SnO2 • Experimental & Theoretical • Measurements: (approximately 4-5 weeks beamtime per year) • SXE / XAS at: • O K (1s) edge –> O 2p states • Co L2,3 (2p) edge -> Co 3d, 4s states • RIXS measurements at: • O K (1s) edge –> O 2p -> Co 3d excitations • Co L2,3 (2p) edge -> Co 3d->3d excitations & Co 3d-> O 2p excitations • SXE/XMCD measurements • Measure element specific spin and orbital moments • Theoretical: • Modelling of metal 2p RIXS spectra using appropriate multiplet structure codes • Instrumentation: • Development of instrumentation for SXEXMCD measurements

  10. Cormac McGuinness Cormac.McGuinness@tcd.ie Physics Department Trinity College Dublin X-ray Emission Spectroscopy • Soft x-ray emission and resonant inelastic x-ray scattering of transition metal doped semiconductors

  11. 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

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