Spatial-dispersion and relativistic effects in the optical sum rules

Authors
Scandolo, S Bassani, F Lucarini, V
Citation
S. Scandolo et al., Spatial-dispersion and relativistic effects in the optical sum rules, EUR PHY J B, 23(3), 2001, pp. 319-323
Citations number
15
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
EUROPEAN PHYSICAL JOURNAL B
ISSN journal
14346028 → ACNP
Volume
23
Issue
3
Year of publication
2001
Pages
319 - 323
Database
ISI
SICI code
1434-6028(200110)23:3<319:SAREIT>2.0.ZU;2-#
Abstract
We describe a procedure to take into account the spatial dispersion of the optical excitations in the susceptibility sum rules. We show that this impl ies that relativistic corrections of the same order must be considered. The final result is a decrease of the total oscillator strength equal to the r atio of the average electron kinetic energy with mc(2). We propose experime nts with synchrotron radiation sources on crystals of heavy elements to obs erve the described effect.