TY - JOUR
T1 - Probing a molecular electronic transition by two-colour sum-frequency generation spectroscopy
AU - Humbert, Christophe
AU - Dreesen, Laurent
AU - Nihonyanagi, Satoshi
AU - Masuda, T.
AU - Kondo, T.
AU - Mani, Alaa Addin
AU - Uosaki, Kohei
AU - Peremans, André
A2 - Thiry, Paul
PY - 2003
Y1 - 2003
N2 - 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 cm1),
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 pi'pi* 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.
AB - 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 cm1),
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 pi'pi* 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.
M3 - Article
VL - 212-213
SP - 797
EP - 803
JO - Applied Surface Science
JF - Applied Surface Science
ER -