Document Detail

The evolution of the electronic structure at the Bi/Ag(111) interface studied using photoemission spectroscopy.
MedLine Citation:
PMID:  23032482     Owner:  NLM     Status:  Publisher    
The growth of Bi on Ag(111) induces different surface structures, including [Formula: see text] surface alloy, Bi-[Formula: see text] overlayer and Bi(110) thin film, as a function of increasing Bi coverage. Here we report the study of electronic states of these structures using core level and valence band photoemission spectroscopy at room temperature. The sp-derived Shockley surface state on Ag(111) is rapidly quenched upon deposition of Bi, due to the strong variation of the in-plane surface potential in the Ag(2)Bi surface alloy. The Bi 4f core levels of the [Formula: see text] alloy and Bi(110) thin film are shifted to lower binding energy by ∼0.6 eV and ∼0.3 eV compared with the Bi bulk value, respectively. Mechanisms inducing the core level shifts are discussed as due to a complex superposition of several factors. As Bi coverage increases and a Bi(110) overlayer forms on Ag(111), a new state is observed at ∼0.9 ML arising from electronic states localized at the Ag-Bi interface. Finally the change of work function as a function of coverage is discussed on the basis of a charge transfer model.
K H L Zhang; I M McLeod; M Lahti; K Pussi; V R Dhanak
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-03
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  24     ISSN:  1361-648X     ISO Abbreviation:  J Phys Condens Matter     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  435502     Citation Subset:  -    
Department of Chemistry, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK.
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