Langmuirndash;Blodgett monolayer assemblies, which contained dye molecules, have been deposited on silver films. Excitonndash;surface plasmon interactions have been studied with attenuated total reflection (ATR) spectroscopy. Reflectivity and dispersion curves for plasmon surface polaritons (PSPrsquo;s) at the metal interface are reported for both angular and wavelength scans. In agreement with theory dispersion curves from angle scans exhibit a double lsquo;lsquo;back bendingrsquo;rsquo; at the transverse exciton frequency ohgr;T(due to PSP interaction with the in plane component of the dye transition dipole moment) and at the longitudinal frequency ohgr;L(due to PSP interaction with a perpendicular component). Correspondingly, dispersion curves from wavelength scans break into separate branches at these frequencies.
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