We report a systematic investigation of the electronic structure of chemisorbed alkali atoms (Li-Cs) on a Ag(111) surface by two-photon photoemission
spectroscopy. Angle-resolved two-photon photoemission spectra are obtained
for 0-0.1 monolayer coverage of alkali atoms. The interfacial electronic structure as a
function of periodic properties and the coverage of alkali atoms is observed and
interpreted assuming ionic adsorbate/substrate interaction. The energy of the alkali
atom s-resonance at the limit of zero coverage is primarily determined by the image
charge interaction, whereas at finite alkali atom coverages, it follows the formation of a
dipolar surface field. The coverage- and angle-dependent two-photon photoemission
spectra provide information on the photoinduced charge-transfer excitation of
adsorbates on metal surfaces. This work complements the previous work on alkali/
Cu(111) chemisorption
Revised: September 29, 2015 |
Published: September 1, 2011
Citation
Wang L., V. Sametoglu, A. Winkelmann, J. Zhao, and H. Petek. 2011.Two-Photon Photoemission Study of the Coverage-Dependent Electronic Structure of Chemisorbed Alkali Atoms on a Ag(111) Surface.Journal of Physical Chemistry A 115, no. 34:9479-9484. doi:10.1021/jp111932r