A study of the influence of halide adsorption on a reconstructed Au(111) electrode by second harmonic generation
1991; Elsevier BV; Volume: 251-252; Linguagem: Inglês
10.1016/0039-6028(91)91060-b
ISSN1879-2758
AutoresK. Andreas Friedrich, Curtis Shannon, Bruno Pettinger,
Tópico(s)Advanced Chemical Physics Studies
ResumoOptical second harmonic generation (SHG) rotational anisotropy measurements were employed to study the influence of specifically adsorbed anions on the reconstructed Au(111)-(1 × 23) surface. Azimuthal rotation of the gold electrode at different potentials yields for the unreconstructed Au(111)-(1 × 1) surface the well-known three-fold symmetry pattern, while for the reconstructed Au(111)-(1 × 23) an additional one-fold symmetry pattern is observed, which leads to an assignment of Cs-symmetry for this surface. Due to the observation of this symmetry change Cs → C3v it is possible to monitor in situ the reversible transition between Au(111)-(1 × 23) and Au(111)-(1 × 1). While in perclorate solution the phase transition occurs over a wide potential region, in halide containing solution the same phase transition is restricted to the sharp potential region typical for the halide adsorption.
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