Resonant X-ray emission with a standing wave excitation

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Ruotsalainen , K O , Honkanen , A-P , Collins , S P , Monaco , G , Moretti Sala , M , Krisch , M , Hämäläinen , K , Hakala , M & Huotari , S 2016 , ' Resonant X-ray emission with a standing wave excitation ' , Scientific Reports , vol. 6 , 22648 .

Title: Resonant X-ray emission with a standing wave excitation
Author: Ruotsalainen, Kari O.; Honkanen, Ari-Pekka; Collins, Stephen P.; Monaco, Giulio; Moretti Sala, Marco; Krisch, Michael; Hämäläinen, Keijo; Hakala, Mikko; Huotari, Simo
Contributor organization: Department of Physics
Date: 2016-03-03
Language: eng
Number of pages: 5
Belongs to series: Scientific Reports
ISSN: 2045-2322
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.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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