The use of low-energy electrons (E_p=1-3 KeV)in the reflection scattering geometry has greatly contributed to the knowledge of a wide series of structural parameters at atomic scale because of their low penetration depth and their strong coupling with the elementary excitations of the investigated system. We present recent experimental and theoretical results obtained by means of two electron techniques, namely the EELFS(Extended Energy Loss Fine Structure) and the EXAFS (Extended Fine Auger Structure) which relate to the most commonly used surface technique to study the short range order in terms of radial distribution function, coordination numbers, thermal effects, etc. The EELFS analysis obtained above the oxygen and magnesium ionization K edges of a MgO(100) surface suggests that the surface lattice parameters are identical to those of the bulk so that, within our experimental resolution, we exclude any inward relaxation of the topmost layer, as suggested by previous measurements.
DE CRESCENZI, M., Motta, N., Patella, F., Sgarlata, A., Arciprete, F., Balzarotti, A., et al. (1991). MgO(100) structural investigations using EELFS and EXFAS techniques. In v.H.M. Tong S.Y. (a cura di), The Structure of Surfaces III (pp. 665). Berlino : Springer Verlag.
MgO(100) structural investigations using EELFS and EXFAS techniques
DE CRESCENZI, MAURIZIO;PATELLA, FULVIA;SGARLATA, ANNA;ARCIPRETE, FABRIZIO;BALZAROTTI, ADALBERTO;
1991-01-01
Abstract
The use of low-energy electrons (E_p=1-3 KeV)in the reflection scattering geometry has greatly contributed to the knowledge of a wide series of structural parameters at atomic scale because of their low penetration depth and their strong coupling with the elementary excitations of the investigated system. We present recent experimental and theoretical results obtained by means of two electron techniques, namely the EELFS(Extended Energy Loss Fine Structure) and the EXAFS (Extended Fine Auger Structure) which relate to the most commonly used surface technique to study the short range order in terms of radial distribution function, coordination numbers, thermal effects, etc. The EELFS analysis obtained above the oxygen and magnesium ionization K edges of a MgO(100) surface suggests that the surface lattice parameters are identical to those of the bulk so that, within our experimental resolution, we exclude any inward relaxation of the topmost layer, as suggested by previous measurements.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
