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Resonant X-ray emission with a standing wave excitation

DOI: 10.1038/srep22648 DOI Help

Authors: Kari O. Ruotsalainen (University of Helsinki) , Ari-pekka Honkanen (University of Helsinki) , Stephen P. Collins (Diamond Light Source) , Giulio Monaco (University of Trento) , Marco Moretti Sala (ESRF - The European Synchrotron) , Michael Krisch (ESRF - The European Synchrotron) , Keijo Hämäläinen (University of Helsinki) , Mikko Hakala (University of Helsinki) , Simo Huotari (University of Helsinki)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 6

State: Published (Approved)
Published: March 2016

Open Access Open Access

Abstract: The Borrmann effect is the anomalous transmission of x-rays in perfect crystals under diffraction conditions. It arises from the interference of the incident and diffracted waves, which creates a standing wave with nodes at strongly absorbing atoms. Dipolar absorption of x-rays is thus diminished, which makes the crystal nearly transparent for certain x-ray wave vectors. Indeed, a relative enhancement of electric quadrupole absorption via the Borrmann effect has been demonstrated recently. Here we show that the Borrmann effect has a significantly larger impact on resonant x-ray emission than is observable in x-ray absorption. Emission from a dipole forbidden intermediate state may even dominate the corresponding x-ray spectra. Our work extends the domain of x-ray standing wave methods to resonant x-ray emission spectroscopy and provides means for novel spectroscopic experiments in d- and f-electron systems.

Journal Keywords: Chemistry; Materials science; Physics

Subject Areas: Physics

Facility: European Synchrotron Radiation Facility (ESRF)

Added On: 31/01/2017 14:05

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