Reference : Probing a molecular electronic transition by two-colour sum-frequency generation spec...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Probing a molecular electronic transition by two-colour sum-frequency generation spectroscopy
Humbert, Christophe [ > > ]
Dreesen, Laurent mailto [Université de Liège - ULiège > Département de physique > Biophotonique >]
Nihonyanagi, S. [ > > ]
Masuda, T. [ > > ]
Kondo, T. [ > > ]
Mani, A. A. [ > > ]
Uosaki, K. [ > > ]
Thiry, P. A. [ > > ]
Peremans, A. [ > > ]
Applied Surface Science
Elsevier Science
Yes (verified by ORBi)
The Netherlands
[en] We demonstrate that a new emerging technique, two-colour sum-frequency generation (SFG) spectroscopy, can be used to probe the molecular electronic properties of self-assembled monolayers (SAMs). In the CH spectral range (2800–3200 cm-1), we show that the sum-frequency generation signal of a porphyrin alkanethiol derivative adsorbed on Pt(1 1 1) reaches a maximum intensity at ~435 nm SFG wavelength. This wavelength corresponds to the porphyrin moiety specific p–p*$ molecular electronic transition which is called the Soret or B band. This resonant behaviour is not observed for 1-dodecanethiol SAMs, which are devoid of molecular electronic transition in the investigated visible spectral range.
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