Journal Article

DESY-2014-01773

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds

Sahle, C. J. (Corresponding author) ; Sternemann, C.Extern* ; Sternemann, H. ; Tse, J. S. ; Gordon, R. A. ; Desgreniers, S. ; Maekawa, S. ; Yamanaka, S. ; Lehmkühler, F.DESY* ; Wieland, D. C. F. ; Mende, K.Extern* ; Huotari, S. ; Tolan, M.Extern*

2014
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0953-4075/47/4/045102

Abstract: The shape of the Ba 4d–4f giant dipole resonance is studied for Ba atoms embedded inside complex Si networks covering structures consisting of Si nanocages and nanotubes, i.e. the clathrate Ba8Si46, the complex compound BaSi6, and the semiconducting BaSi2. Here, non-resonant x-ray Raman scattering is used to investigate confinement effects on the shape of the giant resonance in the vicinity of the Ba NIV, V-edge. The distinct momentum transfer dependence of the spectra is analyzed and discussed. The measurements are compared to calculations of the giant resonance within time-dependent local density approximation in the dipole limit. No modulation of the giant resonance's shape for Ba atoms confined in different local environments was observed, in contrast to the calculations. The absence of such shape modulation for complex Ba/Si compounds is discussed providing important implications for further studies of giant resonance phenomena utilizing both theory and experiment.

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Contributing Institute(s):

1. Coherent X-ray Scattering (FS-CXS)
2. DOOR-User (DOOR)

Research Program(s):

1. FS In-house research / external facilities (POF2-544) (POF2-544)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2014

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Database coverage:
; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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