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Stimulated resonant x-ray Raman scattering with incoherent radiation

MPS-Authors
/persons/resource/persons185052

Weninger,  Clemens
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Center for Free Electron Laser Science, 22607 Hamburg, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons145791

Rohringer,  Nina
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Center for Free Electron Laser Science, 22607 Hamburg, Germany;

External Ressource
Fulltext (public)

PhysRevA.88.053421.pdf
(Publisher version), 3MB

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Citation

Weninger, C., & Rohringer, N. (2013). Stimulated resonant x-ray Raman scattering with incoherent radiation. Physical Review A, 88(5): 053421. doi:10.1103/PhysRevA.88.053421.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-E27E-2
Abstract
We present a theoretical study on stimulated electronic Raman scattering in neon by resonant excitation with an x-ray free electron laser (XFEL). This study is in support of the recent experimental demonstration [C. Weninger et al., Phys. Rev. Lett. (to be published)] of stimulated x-ray Raman scattering. Focusing the broadband XFEL pulses into a cell of neon gas at atmospheric pressure a strong inelastic x-ray scattering signal in the forward direction was observed, as the x-ray energy was varied across the region of core-excited Rydberg states and the K edge. The broadband and intrinsically incoherent x-ray pulses from the XFEL lead to a rich, structured line shape of the scattered radiation. We present a generalized Maxwell-Liouville–von Neumann approach to self-consistently solve for the amplification of the scattered radiation along with the time evolution of the density matrix of the atomic and residual ionic system. An in-depth analysis of the evolution of the emission spectra as a function of the Raman gain is presented. Furthermore, we propose the use of statistical methods to obtain high-resolution scattering data beyond the lifetime broadening despite pumping with incoherent x-ray pulses.