RAMAN-SPECTROSCOPY OF LB FILMS AND MONOLAYERS AT THE AIR-WATER-INTERFACE

Unenhanced Raman spectroscopy has so far been very rarely applied for studying monolayer organization although this method should in princip le bring very rich molecular information. Moreover it is probably one of the most convenient technique for in-situ experiments, especially a t the air-liquid interface. Recent technical developments (N-2-cooled CCD detector, notch holographic filter, confocal microscopy, etc.) hav e been implemented in our laboratory in order to design an ultrasensit ive Raman spectrometer able to study a single monolayer deposited on a solid substrate or spread at the air-water interface. Test Raman spec tra concerning mainly hydrogenated and deuterated cadmium arachidate m ulti- and monolayers deposited on a CaF2 plate and a monolayer spread at the air-water interface are presented. Finally all these results ar e gathered and discussed in terms of molecular organization and hydroc arbon chain packing in the monolayer.