TY  - JOUR
AU  - Sahle, Ch. J.
AU  - Sternemann, C.
AU  - Sternemann, H.
AU  - Tse, J. S.
AU  - Gordon, R. A.
AU  - Desgreniers, S.
AU  - Maekawa, S.
AU  - Yamanaka, S.
AU  - Lehmkühler, F.
AU  - Wieland, D. C. F.
AU  - Mende, K.
AU  - Huotari, S.
AU  - Tolan, Metin
TI  - The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds
JO  - Journal of physics / B
VL  - 47
IS  - 4
SN  - 1361-6455
CY  - Bristol
PB  - IOP Publ.
M1  - DESY-2014-01773
SP  - 045102
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000331949100004
DO  - DOI:10.1088/0953-4075/47/4/045102
UR  - https://bib-pubdb1.desy.de/record/167421
ER  -