Acceleration of atomic dynamics due to localized energy depositions under X-ray irradiation

Autor(en)

Michael Leitner, Markus Stana, Manuel Ross, Bogdan Sepiol

Abstrakt

The effect of the absorption of hard X-ray photons on the solid-state dynamics, at energies below the defect creation threshold, is considered. First, it is shown that due to the sensitivity to parameter choices, the present state of the theoretical description of photon-electron-lattice coupling cannot decide on whether the local energy deposition due to the absorption of single photons leads to an acceleration of atomic dynamics at fluences before macroscopic effects due to sample heating set in. Second, a direct study of the dynamics under different incident photon fluxes by atomic-scale X-ray Photon Correlation Spectroscopy (aXPCS) is reported, which provides an upper bound of 0.005 additional atomic jumps per absorbed photon of 8 keV. The relevance of such considerations for emergent experimental methods, such as studying atomic dynamics using X-rays as probes, is pointed out.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Technische Universität München

Publikationsdatum

10-2015

ÖFOS 2012

103009 Festkörperphysik, 103008 Experimentalphysik, 103015 Kondensierte Materie

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/da469718-1bce-42df-a88c-43f8b1ec6a2f