Abstract
Abstract The electronic absorption spectra of fatty acid multilayers were measured in the vacuum ultraviolet region with an energy below 10 eV. From the chain length dependence of the spectra, the strong absorption (above 8 eV) was assigned to the σ-σ* transitions in the alkane chain moiety, and the weaker one (below 8 eV), to the transitions in the car boxy lie acid and metal car boxy late moieties. The polarized spectra of the Ba stearate multilayer showed that the band near 8.8 eV was polarized perpendicularly to the alkane chain. The spectra of the stearic acid multilayer without metal ions and the multilayer of the Zn stearate showed that their alkane chains were titled against the normal of the layer plane.
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