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Title: The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds

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 Ba 8Si 46, the complex compound BaSi 6, and the semiconducting BaSi 2. 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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [2];  [2];  [2];  [2]
  1. TU Dortmund
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1149166
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Phys. B; Journal Volume: 47; Journal Issue: 2014
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Sahle, Ch. J., Sternemann, C., Sternemann, H., Tse, J. S., Gordon, R. A., Desgreniers, S., Maekawa, S., Yamanaka, S., Lehmkuhler, F., Wieland, D. C.F., Mende, K., Huotari, S., Tolan, M., Hiroshima), Ottawa), CLS), Saskatchewan), and Helsinki). The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds. United States: N. p., 2014. Web. doi:10.1088/0953-4075/47/4/045102.
Sahle, Ch. J., Sternemann, C., Sternemann, H., Tse, J. S., Gordon, R. A., Desgreniers, S., Maekawa, S., Yamanaka, S., Lehmkuhler, F., Wieland, D. C.F., Mende, K., Huotari, S., Tolan, M., Hiroshima), Ottawa), CLS), Saskatchewan), & Helsinki). The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds. United States. doi:10.1088/0953-4075/47/4/045102.
Sahle, Ch. J., Sternemann, C., Sternemann, H., Tse, J. S., Gordon, R. A., Desgreniers, S., Maekawa, S., Yamanaka, S., Lehmkuhler, F., Wieland, D. C.F., Mende, K., Huotari, S., Tolan, M., Hiroshima), Ottawa), CLS), Saskatchewan), and Helsinki). Wed . "The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds". United States. doi:10.1088/0953-4075/47/4/045102.
@article{osti_1149166,
title = {The Ba 4d-4f giant dipole resonance in complex Ba/Si compounds},
author = {Sahle, Ch. J. and Sternemann, C. and Sternemann, H. and Tse, J. S. and Gordon, R. A. and Desgreniers, S. and Maekawa, S. and Yamanaka, S. and Lehmkuhler, F. and Wieland, D. C.F. and Mende, K. and Huotari, S. and Tolan, M. and Hiroshima) and Ottawa) and CLS) and Saskatchewan) and Helsinki)},
abstractNote = {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.},
doi = {10.1088/0953-4075/47/4/045102},
journal = {J. Phys. B},
number = 2014,
volume = 47,
place = {United States},
year = {Wed Aug 06 00:00:00 EDT 2014},
month = {Wed Aug 06 00:00:00 EDT 2014}
}