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Resonant core spectroscopies of the charge transfer interactions between C60 and the surfaces of Au(111), Ag(111), Cu(111) and Pt(111)

Gibson, Andrew J.; Temperton, Robert H.; Handrup, Karsten LU and O'Shea, James N (2017) In Surface Science 657. p.69-78
Abstract

Charge transfer interactions between C60 and the metal surfaces of Ag(111), Cu(111), Au(111) and Pt(111) have been studied using synchrotron-based photoemission, resonant photoemission and X-ray absorption spectroscopies. By placing the X-ray absorption and valence band spectra on a common binding energy scale, the energetic overlap of the unoccupied molecular orbitals with the density of states of the underlying metal surface have been assessed in the context of possible charge transfer pathways. Resonant photoemission and resonant Auger data, measuring the valence region as a function of photon energy for C60 adsorbed on Au(111) reveals three constant high kinetic energy features associated with Auger-like... (More)

Charge transfer interactions between C60 and the metal surfaces of Ag(111), Cu(111), Au(111) and Pt(111) have been studied using synchrotron-based photoemission, resonant photoemission and X-ray absorption spectroscopies. By placing the X-ray absorption and valence band spectra on a common binding energy scale, the energetic overlap of the unoccupied molecular orbitals with the density of states of the underlying metal surface have been assessed in the context of possible charge transfer pathways. Resonant photoemission and resonant Auger data, measuring the valence region as a function of photon energy for C60 adsorbed on Au(111) reveals three constant high kinetic energy features associated with Auger-like core-hole decay involving an electron transferred from the surface to the LUMO of the molecule and electrons from the three highest occupied molecular orbitals, respectively and in the presence of ultra-fast charge transfer of the originally photoexcited molecule to the surface. Data for the C60/Ag(111) surface reveals an additional Auger-like feature arising from a core-hole decay process involving more than one electron transferred from the surface into the LUMO. An analysis of the relative abundance of these core-hole decay channels estimates that on average 2.4 ± 0.3 electrons are transferred from the Ag(111) surface into the LUMO. A core-hole clock analysis has also been applied to assess the charge transfer coupling in the other direction, from the molecule to the Au(111) and Ag(111) surfaces. Resonant photoemission and resonant Auger data for C60 molecules adsorbed on the Pt(111) and Cu(111) surfaces are shown to exhibit no super-Auger features, which is attributed to the strong modification of the unoccupied molecular orbitals arising from stronger chemical coupling of the molecule to the surface.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Autoionisation, Charge transfer, Core-hole clock, Fullerenes, Metal surfaces, Resonant photoemission
in
Surface Science
volume
657
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85000885244
  • wos:000392777800011
ISSN
0039-6028
DOI
10.1016/j.susc.2016.11.009
language
English
LU publication?
yes
id
800e667e-bcfb-4347-ab1a-0a8853aeeb3f
date added to LUP
2017-02-03 08:39:36
date last changed
2018-01-07 11:47:55
@article{800e667e-bcfb-4347-ab1a-0a8853aeeb3f,
  abstract     = {<p>Charge transfer interactions between C<sub>60</sub> and the metal surfaces of Ag(111), Cu(111), Au(111) and Pt(111) have been studied using synchrotron-based photoemission, resonant photoemission and X-ray absorption spectroscopies. By placing the X-ray absorption and valence band spectra on a common binding energy scale, the energetic overlap of the unoccupied molecular orbitals with the density of states of the underlying metal surface have been assessed in the context of possible charge transfer pathways. Resonant photoemission and resonant Auger data, measuring the valence region as a function of photon energy for C<sub>60</sub> adsorbed on Au(111) reveals three constant high kinetic energy features associated with Auger-like core-hole decay involving an electron transferred from the surface to the LUMO of the molecule and electrons from the three highest occupied molecular orbitals, respectively and in the presence of ultra-fast charge transfer of the originally photoexcited molecule to the surface. Data for the C<sub>60</sub>/Ag(111) surface reveals an additional Auger-like feature arising from a core-hole decay process involving more than one electron transferred from the surface into the LUMO. An analysis of the relative abundance of these core-hole decay channels estimates that on average 2.4 ± 0.3 electrons are transferred from the Ag(111) surface into the LUMO. A core-hole clock analysis has also been applied to assess the charge transfer coupling in the other direction, from the molecule to the Au(111) and Ag(111) surfaces. Resonant photoemission and resonant Auger data for C<sub>60</sub> molecules adsorbed on the Pt(111) and Cu(111) surfaces are shown to exhibit no super-Auger features, which is attributed to the strong modification of the unoccupied molecular orbitals arising from stronger chemical coupling of the molecule to the surface.</p>},
  author       = {Gibson, Andrew J. and Temperton, Robert H. and Handrup, Karsten and O'Shea, James N},
  issn         = {0039-6028},
  keyword      = {Autoionisation,Charge transfer,Core-hole clock,Fullerenes,Metal surfaces,Resonant photoemission},
  language     = {eng},
  month        = {03},
  pages        = {69--78},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Resonant core spectroscopies of the charge transfer interactions between C<sub>60</sub> and the surfaces of Au(111), Ag(111), Cu(111) and Pt(111)},
  url          = {http://dx.doi.org/10.1016/j.susc.2016.11.009},
  volume       = {657},
  year         = {2017},
}