Seminars Archive

Maurizio Benfatto

Abstract




Wednesday, October 18, 2000, 14:30


Seminar Room, ground floor, Building "T"


Sincrotrone Trieste, Basovizza




Resonant atomic scattering factor theory: a multiple scattering approach



Maurizio Benfatto

(Laboratori Nazionali di Frascati dellí INFN ITALY)



ABSTRACT
A new approach for the x-ray atomic scattering factor (ASF) calculation
is developed on the basis of the multiple-scattering theory. This method
allows a first principle calculation of the ASF in the anomalous dispersion
energy region including the influence of the local environment around the
resonant atom. Real and imaginary parts of the ASF are obtained in terms
of incoming and out coming polarization vectors for any scattering conditions
without the use of Kramers-Kroening transformations. The method has
been applied, as an example, to the calculation of the anomalous ASF components
of the Ge and compared with the experimental data taken from bulk crystal
reflections and surface reconstruction peaks.