title: Local chiral-symmetry breaking in globally centrosymmetric crystals.
abstract: A thorough tensor analysis of the Bragg-forbidden reflection (00.3)(h) in corundum systems having a global center of inversion, such as V2O3 and alpha-Fe2O3, shows that anomalous x-ray resonant diffraction can access chiral properties related to the dipole-quadrupole (E1-E2) channel via an interference with the pure quadrupole-quadrupole (E2-E2) process. This is also confirmed by independent ab initio numerical simulations. In such a way, it becomes possible to detect chiral quantities in systems where dichroic absorption techniques are ineffective.
authors.affiliation: INFN Laboratori Nazionali di Frascati, CP 13, I-00044 Frascati, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Di Matteo
authors.forename: Y
authors.initials: Y
authors.lastname: Joly
authors.forename: A
authors.initials: A
authors.lastname: Bombardi
authors.forename: L
authors.initials: L
authors.lastname: Paolasini
authors.forename: F
authors.initials: F
authors.lastname: de Bergevin
authors.forename: C R
authors.initials: CR
authors.lastname: Natoli