Reversible changes in the vibrational structure of tetra-tert- butylazobenzene on a Au(111) surface induced by light and thermal activation

L. Óvári, Martin Wolf, Petra Tegeder

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

High-resolution electron energy loss spectroscopy (HREELS) is employed to analyze reversible changes in the geometrical structure of the molecular switch tetra-tert-butylazobenzene (TBA) adsorbed on Au(111), which are induced by UV-light and thermal activation. In the submonolayer regime, TBA adsorbs in the planar trans configuration. UV-light exposure at 3.5 eV leads to pronounced changes in the vibrational structure of the TBA molecules in direct contact with the Au(111) surface, which we assign to a trans to cis isomerization. The reverse process, that is, the cis to trans isomerization, can be stimulated by thermal activation. An intensity decrease of vibrational modes as a function of photon dose allows calculation of an effective cross section of σeff ≈ 2 × 10-21 cm2 for the trans to cis isomerization.

Original languageEnglish
Pages (from-to)15370-15374
Number of pages5
JournalJournal of Physical Chemistry C
Volume111
Issue number42
DOIs
Publication statusPublished - Oct 25 2007

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Isomerization
isomerization
Chemical activation
activation
Ultraviolet radiation
Electron energy loss spectroscopy
vibration mode
Photons
switches
energy dissipation
Switches
electron energy
dosage
Molecules
high resolution
cross sections
photons
configurations
spectroscopy
Hot Temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Reversible changes in the vibrational structure of tetra-tert- butylazobenzene on a Au(111) surface induced by light and thermal activation. / Óvári, L.; Wolf, Martin; Tegeder, Petra.

In: Journal of Physical Chemistry C, Vol. 111, No. 42, 25.10.2007, p. 15370-15374.

Research output: Contribution to journalArticle

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