Double beam FT-IR reflection spectroscopy on monolayers
Résumé
For in situ infrared studies of ultrathin films deposited on solid substrates or spread at an air/liquid interface, we have developed a new FT-IR double beam approach basedondifferential reflectivity by polarization modulation. Beca use only the s-component (perpendicula r to the plane of incidence) of th e electromagnetic tield is inciden t o n the studied surface. the spectral fea tures a reeasy to interpret in terms of molccular orientation. Spectra of a cadmium a rachidate La ngmuir- Blodgett film deposited on a goldmirrar and a DMPC Langmuir film spread at the air/water interface