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Adsorption and charge transfer interactions of bi-isonicotinic acid on Ag(111)

Temperton, Robert H.; Gibson, Andrew J.; Handrup, Karsten LU and O'Shea, James N (2017) In Journal of Chemical Physics 147(5).
Abstract

The adsorption and charge transfer dynamics of the organic molecule bi-isonicotinic acid (4,4-dicarboxy-2,2-bipyridine) on single crystal Ag(111) has been studied using synchrotron radiation-based photoemission, x-ray absorption, and resonant core spectroscopies. Measurements for multilayer and monolayer coverage are used to determine the nature of the molecule-surface interactions and the molecular orientation. An experimental density of states for the monolayer with respect to the underlying metal surface is obtained by combining x-ray absorption spectroscopy at the N 1s edge and valence photoemission to measure the unoccupied and occupied valence states, respectively. This shows that the lowest unoccupied molecular orbital in the... (More)

The adsorption and charge transfer dynamics of the organic molecule bi-isonicotinic acid (4,4-dicarboxy-2,2-bipyridine) on single crystal Ag(111) has been studied using synchrotron radiation-based photoemission, x-ray absorption, and resonant core spectroscopies. Measurements for multilayer and monolayer coverage are used to determine the nature of the molecule-surface interactions and the molecular orientation. An experimental density of states for the monolayer with respect to the underlying metal surface is obtained by combining x-ray absorption spectroscopy at the N 1s edge and valence photoemission to measure the unoccupied and occupied valence states, respectively. This shows that the lowest unoccupied molecular orbital in the core-excited state lies energetically below the Fermi level of the surface allowing charge transfer from the metal into this orbital. Resonant photoelectron spectroscopy was used to probe this charge transfer in the context of super-spectator and super-Auger electron transitions. The results presented provide a novel interpretation of resonant core-level spectroscopy to explore ultra-fast charge transfer between an adsorbed organic molecule and a metal surface through the observation of electrons from the metal surface playing a direct role in the core-hole decay of the core-excited molecule.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
147
issue
5
publisher
American Institute of Physics
external identifiers
  • scopus:85026820516
  • wos:000407292200019
ISSN
0021-9606
DOI
10.1063/1.4996746
language
English
LU publication?
yes
id
a3ef2602-c393-4141-9e6d-79269883ad1d
date added to LUP
2017-08-29 14:06:04
date last changed
2017-09-18 11:43:24
@article{a3ef2602-c393-4141-9e6d-79269883ad1d,
  abstract     = {<p>The adsorption and charge transfer dynamics of the organic molecule bi-isonicotinic acid (4,4-dicarboxy-2,2-bipyridine) on single crystal Ag(111) has been studied using synchrotron radiation-based photoemission, x-ray absorption, and resonant core spectroscopies. Measurements for multilayer and monolayer coverage are used to determine the nature of the molecule-surface interactions and the molecular orientation. An experimental density of states for the monolayer with respect to the underlying metal surface is obtained by combining x-ray absorption spectroscopy at the N 1s edge and valence photoemission to measure the unoccupied and occupied valence states, respectively. This shows that the lowest unoccupied molecular orbital in the core-excited state lies energetically below the Fermi level of the surface allowing charge transfer from the metal into this orbital. Resonant photoelectron spectroscopy was used to probe this charge transfer in the context of super-spectator and super-Auger electron transitions. The results presented provide a novel interpretation of resonant core-level spectroscopy to explore ultra-fast charge transfer between an adsorbed organic molecule and a metal surface through the observation of electrons from the metal surface playing a direct role in the core-hole decay of the core-excited molecule.</p>},
  articleno    = {054703},
  author       = {Temperton, Robert H. and Gibson, Andrew J. and Handrup, Karsten and O'Shea, James N},
  issn         = {0021-9606},
  language     = {eng},
  month        = {08},
  number       = {5},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Adsorption and charge transfer interactions of bi-isonicotinic acid on Ag(111)},
  url          = {http://dx.doi.org/10.1063/1.4996746},
  volume       = {147},
  year         = {2017},
}