Role of the Substrate Orientation in the Photoinduced Electron Dynamics at the Porphyrin/Ag Interface

Stefania Pagliara, Silvia Tognolini, Stefano Ponzoni, Francesco Sedona, Mauro Sambi

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

5 Citazioni (Scopus)

Abstract

Photochemically activated reactions, despite being a powerful tool to covalently stabilize self-organized molecular structures on metallic surfaces, have struggled to take off due to several not yet well understood light-driven processes that can affect the final result. A thorough understanding of the photoinduced charge transfer mechanisms at the organic/metal interface would pave the way to controlling these processes and to developing on-surface photochemistry. Here, by time-resolved two-photon photoemission measurements, we track the relaxation processes of the first two excited molecular states at the interface between porphyrin, the essential chromophore in chlorophyll, and two different orientations of the silver surface. Due to the energy alignment of the porphyrin first excited state with the unoccupied sp-bands, an indirect charge transfer path, from the substrate to the molecule, opens in porphyrin/Ag(100) 250 fs after the laser pump excitation. The same time-resolved measurements carried out on porphyrin/Ag(111) show that in the latter case such an indirect path is not viable.
Lingua originaleEnglish
pagine (da-a)3632-3638
Numero di pagine7
RivistaTHE JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume18
DOI
Stato di pubblicazionePubblicato - 2015

Keywords

  • Organic/metal interface
  • time-resolved photoemission

Fingerprint

Entra nei temi di ricerca di 'Role of the Substrate Orientation in the Photoinduced Electron Dynamics at the Porphyrin/Ag Interface'. Insieme formano una fingerprint unica.

Cita questo