Self-assembled organic and fullerene monolayers characterisation by two-colour SFG spectroscopy: a pathway to meet doubly resonant SFG process

Two-colour sum-frequency generation (two-colour SFG) spectroscopy was used to probe both vibrational and electronic properties of 1-dodecanethiol/Ag(1 1 1), Au(1 1 1), and Pt(1 1 1), of 5-[p-(6-mercaptohexoxy)-phenyl]-10,15,20-triphenylporphin/Pt(1 1 1), and of C60/Ag(1 1 1). The role of the various physical parameters determining the sum-frequency generation (SFG) intensity equation is highlighted. The enhancement of the non-linear second order susceptibility in the aforementioned interfaces is explained in terms of metal interband transition, molecular electronic transition and of electron–phonon coupling, respectively

High resolution electron energy loss spectroscopy of GaAs and AlAs grown by molecular beam epitaxy

International audienc

Investigation of the AlAsGaAs interface by high resolution electron energy loss spectroscopy

International audienc

ADSORBATE INDUCED VIBRATIONS MEASURED BY EELS ON A CuZn α 75/25 (110) SURFACE DURING ITS EARLY STAGE OF OXIDATION

Using high resolution electron energy loss spectroscopy (EELS), we have measured three vibrational bands on a clean CuZn α 75/25 (110) surface after O2 exposure. The band at 420cm-1 is related to the metal-O stretchifig vibration. The band around 3630 cm-1 is interpreted as the O-H stretching vibration arising from water contamination. At higher coverages, a third band emerges (550 cm-1). It is attributed to an optical surface phonon and associated with a preliminary stage of bulk oxide formation