Nanotech 2002 Vol. 2
Nanotech 2002 Vol. 2
Technical Proceedings of the 2002 International Conference on Computational Nanoscience and Nanotechnology

Materials and Nanostructures Studies Chapter 16

X-ray Absorption Near Edge Structures at the L3,2 and M3,2 edges: A probe for the electronic behavior of metal nanostructures

Authors: Y.M. Yiu and T.K. Sham

Affilation: The University of Western Ontario, Canada

Pages: 458 - 461

Keywords: L-edge XANES, M-edge XANES, 5d metals, DFT, GGA

We present a comparison of the calculation and experiment results of the X-ray Absorption Near Edge Structures (XANES) of the L 3,2-edges and the M 3,2 -edges of representative 5d metals. Emphasis is placed on the first 10 – 15 eV above the Fermi level where the behavior of the relatively localized unoccupied d densities of states of transition metals across the periodic table can be probed. Experimentally, this is where the whiteline appears. The whiteline intensity contains information about the d holes at the metal site. We adopt a method of the Full Potential Linearized Augmented Plane Wave (FPLAPW) based on the Density Functional Theory with the modification of the exchange-correlation energy by Generalized Gradient Approximation (The Wien computer code). The calculation of electronic structure is performed starting by either compressing or expanding the lattices, to minic nanostructural behavior. The results and their implications will be discussed.

ISBN: 0-9708275-6-3
Pages: 504