Dielectric hysteresis in van der Waals solids due to the formation of negative ion resonances

Citation
M. Michaud et al., Dielectric hysteresis in van der Waals solids due to the formation of negative ion resonances, PHYS ESSAYS, 13(2-3), 2000, pp. 325-331
Citations number
22
Categorie Soggetti
Physics
Journal title
PHYSICS ESSAYS
ISSN journal
08361398 → ACNP
Volume
13
Issue
2-3
Year of publication
2000
Pages
325 - 331
Database
ISI
SICI code
0836-1398(200006/09)13:2-3<325:DHIVDW>2.0.ZU;2-R
Abstract
Electron resonances (i.e.. transient anions) in the gas phase are usually f ound in both elastic and inelastic electron-scattering channels of atoms an d molecules, whereas their solid-phase counterparts are observed exclusivel y in inelastic channels. Fano and collaborators originally attributed this effect to a dielectric hysteresis phenomenon, i.e., the electronic polariza tion of the surrounding medium induced by the formation of a transient anio n in a solid causes a small displacement of the atoms or molecules from the ir lattice positions, which do not have time to relax during autoionization of the anion. Thus, the resulting multiphonon excitations replace the elas tic decay channel. Experimental and theoretical evidence of this phenomenon is given for electron-resonance scattering from several crystalline van de r Waals solids.