Probing of an adsorbate-specific excited state on an organic insulating surface by two-photon photoemission spectroscopy

Masahiro Shibuta, Naoyuki Hirata, Toyoaki Eguchi, Atsushi Nakajima

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this study, we investigate the photoexcited electronic states of ferrocene (Fc) molecules adsorbed on an organic insulating surface by two-photon photoemission spectroscopy. This insulating layer, composed of a decanethiolate self-assembled monolayer formed on an Au(111) substrate, enables us to probe the electronically excited states localized at the adsorbed Fc molecules. The adsorbate-specific state is resonantly excited by photons at 4.57 eV, which is 0.5 eV smaller than the energy of the first molecular Rydberg state of free Fc in the gas phase. This result indicates that the electrons are bound to both the excited hole formed in the adsorbate and the positive image charge induced in the substrate. The hybridized electronic characteristics of the adsorbate-specific state are responsible for the strong transition selectivity and short lifetime of the excited state.

Original languageEnglish
Pages (from-to)1825-1831
Number of pages7
JournalJournal of the American Chemical Society
Volume136
Issue number5
DOIs
Publication statusPublished - 2014 Feb 5

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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