Band approach to the excitation-energy dependence of x-ray fluorescence of TiO2
Abstract
Excitation-energy dependence of Ti L2,3 soft x-ray emission spectra (XES) of a TiO2 single crystal is measured near Ti 2p threshold using tuneable synchrotron radiation at excitation energies Eexc=458.2-476.9 eV. It is found that the emission spectra exhibit normal soft x-ray emission features, which do not change with excitation energy and inelastic and resonant x-ray emission features (RXES), which strongly depend on the excitation energy. We are using a band approach in order to discuss the excitation-energy dependence of Ti L2,3 RXES of TiO2. The RXES process is described as a convolution of occupied and unoccupied d states in the intermediate and final states. In this procedure the d states are limited to those which lie in the energy interval Eexc+/-ΔE taking into account the rule of k conservation. We calculate the curves of restricted joint density of states using the full potential linearized muffin-tin orbital method and the results are found to be in reasonable agreement with the experimental Ti L2,3, RXES of TiO2 measured at different excitation energies.
- Publication:
-
Physical Review B
- Pub Date:
- July 1999
- DOI:
- 10.1103/PhysRevB.60.2212
- Bibcode:
- 1999PhRvB..60.2212F
- Keywords:
-
- 78.70.En;
- 71.20.Ps;
- 77.84.Dy;
- X-ray emission spectra and fluorescence;
- Other inorganic compounds;
- Niobates titanates tantalates PZT ceramics etc.