Reversible switching of tetra-tert-butyl-azobenzene on a Au(111) surface induced by light and thermal activation

Autor:	Petra Tegeder, Dhananjay Nandi, Sebastian Hagen, Felix Leyssner, Martin Wolf
Rok vydání:	2007
Předmět:	Molecular switch biology Chemistry Photoemission spectroscopy Annealing (metallurgy) General Physics and Astronomy Electronic structure biology.organism_classification Photochemistry chemistry.chemical_compound Azobenzene Tetra Molecule Physical and Theoretical Chemistry Isomerization
Zdroj:	Chemical Physics Letters. 444:85-90
ISSN:	0009-2614
DOI:	10.1016/j.cplett.2007.07.005
Popis:	Two-photon photoemission spectroscopy is employed to analyze reversible changes in the electronic structure of the molecular switch tetra- tert -butyl-azobenzene (TBA) adsorbed on Au(1 1 1), which are induced by UV-light and thermal activation. Cycles of illumination and annealing steps confirm the reversibility of the switching process, which we assign to a trans / cis -isomerization of TBA molecules in direct contact with the Au(1 1 1) surface. Pronounced changes in the photoelectron spectra due to UV-light exposure allow to calculate an effective cross section of σ eff ≈ 8 × 10 −22 cm −2 at 4.14 eV and σ eff ≈ 4 × 10 −21 cm −2 at 4.4 eV, respectively, for the trans - to cis -isomerization.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::684db6aefa356a1cdc8bfd40718de254 https://doi.org/10.1016/j.cplett.2007.07.005 Zobrazit plný text záznamu Full Text from ScienceDirect