Elettra-Sincrotrone Trieste S.C.p.A. website uses session cookies which are required for users to navigate appropriately and safely. Session cookies created by the Elettra-Sincrotrone Trieste S.C.p.A. website navigation do not affect users' privacy during their browsing experience on our website, as they do not entail processing their personal identification data. Session cookies are not permanently stored and indeed are cancelled when the connection to the Elettra-Sincrotrone Trieste S.C.p.A. website is terminated.
More info

BaDElPh Highlights

Surface-umklapp in ARPES at an organic-metal interface

We show that angle-resolved photoemission performed using low-energy photons on an organic-metal interface allows to clearly distinguish genuine interface states from features of substrate photoelectrons diffracted by the molecular lattice. As a model system an ordered monolayer of Zn-phthalocyanine is used as a diffraction lattice to probe the electronic band structure of a Ag(110) substrate. Photoemission close to normal emission geometry reveals strongly dispersive features absent in the pristine substrate spectra. Density functional theory modeling helped identifying these as bulk sp direct transitions undergoing surface-umklapp processes. The present results establish the important role of final-state diffraction effects in photoemission experiments at organic-inorganic interfaces. Moreover, this phenomenon is illustrated through a series of examples of noble-metal single-crystal surfaces covered by monolayers of large π-conjugated organic molecules. Retrieve articles
Final-state diffraction effects in angle-resolved photoemission at an organic-metal interface
F.C. Bocquet, L. Giovanelli, P. Amsalem, L. Petaccia, D. Topwal, S. Gorovikov, M. Abel, N. Koch, L. Porte, A. Goldoni, J.-M. Themlin,
Phys. Rev. B 84, 241407(R) (2011).
doi: 10.1103/PhysRevB.84.241407

Interpretation of valence band photoemission spectra at organic-metal interfaces
L. Giovanelli, F.C. Bocquet, P. Amsalem, H.-L. Lee, M. Abel, S. Clair, M. Koudia, T. Faury, L. Petaccia, D. Topwal, E. Salomon, T. Angot, A.A. Cafolla, N. Koch, L. Porte, A. Goldoni, J.-M. Themlin,
Phys. Rev. B 87, 035413 (2013).
doi: 10.1103/PhysRevB.87.035413

Ultima modifica il Domenica, 31 Gennaio 2021 15:32