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Second-harmonic generation and surface reconstruction: Cs on Ag(110)

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Reiff,  Stefan
Fritz Haber Institute, Max Planck Society;

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Drachsel,  Wolfgang
Fritz Haber Institute, Max Planck Society;

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Block,  Jochen H.
Fritz Haber Institute, Max Planck Society;

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Citation

Reiff, S., Drachsel, W., & Block, J. H. (1994). Second-harmonic generation and surface reconstruction: Cs on Ag(110). Surface Science, 304(1-2), L420-L426. doi:10.1016/0039-6028(94)90743-9.


Cite as: https://hdl.handle.net/21.11116/0000-0009-944C-B
Abstract
The Cs induced reconstruction of the Ag(110) surface has been investigated by second-harmonic generation (SHG), combined with measurements of the work function change (Δφ) and thermal desorption spectroscopy (TDS). Adsorption of one monolayer of Cs at 100 K leads to a SHG amplification of 1100 compared to the signal level of the clean surface. Through annealing the sample, a local reconstruction can be obtained at temperatures between 165 and 220 K, as a precursor to the long range ordered (1 × 3) and (1 × 2) missing row reconstruction. The onset of the local reconstruction is identified by a sharp decline of the SH intensity. For θCs < 0.24 this can be understood as a variation in the conditions for the resonance of the radiation field with optical transitions between Cs derived resonant levels, caused by a modified adsorption geometry.