Abstract
We report nonresonant x-ray Raman scattering (XRS) measurements for the icosahedral boron carbide for transferred momentum q from 1 to 9 . The observed q-dependence together with site-specific ab initio calculations identify a near-edge peak in the XRS spectra as a p-type exciton due to dominant boron occupation at the sole atomic site in the unit cell having inversion symmetry. This result constrains models of substitutional disorder in introduces a new application of XRS, and emphasizes the utility of full multiple scattering calculations of the site-specific projected density of states for interpretation of the near edge region of XRS spectra.
- Received 19 June 2003
DOI:https://doi.org/10.1103/PhysRevB.69.125402
©2004 American Physical Society