Seminaire : Inelastic x-ray scattering activities at PETRA III

Hasan YAVAS

(Photon Science, DESY, Hamburg, Germany)

As one of the two major experimental programs of the Dynamics Beamline, P01 of PETRA III, inelastic x-ray scattering (IXS) end-stations have been open to general users since 2015. Of the many flavors of IXS, the beamline focuses on core‑level non-resonant inelastic x-ray scattering (NIXS) and resonant inelastic x‑ray scattering (RIXS) techniques. 

NIXS, also known as x-ray Raman scattering (XRS), is used to probe the ground state symmetries of strongly correlated materials that are hard to reach with dipole-limited processes. Thanks to the large momentum transfer attainable with hard x‑rays, NIXS is susceptible to excitations beyond the dipole transition. As a photon-in photon-out technique utilizing hard x‑rays, NIXS finds an additional avenue of unique opportunities to probe shallow absorption edges of materials in sample environments that inhibit conventional x‑ray absorption methods. 

Alternatively, RIXS is a very versatile technique to investigate elementary excitations in correlated systems. Recent advances in resolution and throughput extended the scope of RIXS to low‑lying excitations like magnons and phonons. While RIXS has been limited to 5d (hard x-ray) and 3d (soft x-ray) materials, the recent upgrade of P01 allows access to L edges of 4d materials that are in the tender x-ray energies.

Formalités d’entrée :

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