Measurements of polarization dependencies in parametric down-conversion of x rays into ultraviolet radiation

S. Sofer, O. Sefi, A. G.A. Nisbet, S. Shwartz

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We present measurements of the polarization dependencies of the X-ray signal photons generated by the effect of parametric down-conversion of x rays into ultraviolet radiation. The results exhibit pronounced discrepancies with the classical model for the nonlinearity but qualitatively agree with a recently developed quantum mechanical theory for the nonlinear interaction. Our work shows that the reconstruction of the atomic scale charge distribution of valence electrons in crystals by using nonlinear interaction between x rays and longer wavelength radiation, as was suggested in previous works, requires the knowledge of polarization of the generated X-ray signal beam. The results presented in this work indicate a methodology for the study of properties of the Wannier functions in crystals.

Original languageEnglish
Article number085207
JournalPhysical Review B
Issue number8
StatePublished - 15 Aug 2021

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.


We acknowledge Diamond Light Source for time on Beamline I16 under Proposal No. MT20485. This work was supported by the Israel Science Foundation (ISF) (IL), Grant No. 201/18. The research leading to this result has been supported by the project CALIPSOplus under Grant Agreement No. 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020.

FundersFunder number
Horizon 2020 Framework Programme730872
Israel Science Foundation201/18
Horizon 2020


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