Influence of surface interband transitions on surface plasmon dispersion: K/Ag(110)
Centro di Fisica delle Superfici e delle Basse Temperature del CNR, Istituto Nazionale per la Fisica della Materia, Dipartimento di Fisica, via Dodecaneso 33, 16146 Genova, Italy
2 Institut für Festkörperphysik, Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany
Accepted: 29 June 1998
We demonstrate that the qualitative difference of the Ag surfaces with respect to surface plasmon dispersion (nearly linear for Ag(001) and with strong isotropic quadratic term for Ag(111) and Ag(110)) is due to the presence on Ag(001) of interband transitions which nearly match the surface plasmon energy. A similar situation can be created for Ag(110) by K adsorption, obtaining a strong and abrupt decrease of the quadratic term, while the linear term is nearly unaffected, independently of the onset of the missing row reconstruction.
PACS: 73.20.Mf – Collective excitations (including plasmons and other charge-density excitations) / 82.65.My – Chemisorption / 68.55.-a – Thin film structure and morphology
© EDP Sciences, 1998