Artigo de Periódico
Structure determination of Ag(111) by low-energy electron diffraction
Fecha
1999Registro en:
0039-6028
v. 419, n. 2-3
Autor
Soares, E. A.
Nascimento, Von B.
Carvalho, V. E. de
Castilho, Caio Mário Castro de
Carvalho, A. V. de
Toomes, R.
Woodruff, D. P.
Soares, E. A.
Nascimento, Von B.
Carvalho, V. E. de
Castilho, Caio Mário Castro de
Carvalho, A. V. de
Toomes, R.
Woodruff, D. P.
Institución
Resumen
A quantitative structure determination of the Ag(111) clean surface has been performed using low-energy electron diffraction. Optimisation of the outermost layer spacings and vibrational amplitudes was achieved using two different dynamical scattering computational methods, one using the LEEDFIT code and the second exploiting a Simulated Annealing algorithm implemented on the conventional Van Hove/Tong code. The results obtained show that a bulk-terminated structural model describes the data best (Δd12=0.00±0.02 Å and Δd23=0.00±0.03 Å), and in particular, the analysis excludes a 2.5% contraction of the outermost layer spacing, which was recently reported on the basis of ion-scattering measurements. The LEED result of no contraction is consistent with prior results for the (111) face of several other fcc metals.