Langmuir-Blodgett film with symmetry

Combined with some simple symmetry arguments applicable to infinite-stack systems with regular structures, the dimeric models provide us with a set of selection rules and spectral predictions that make infrared and Raman spectoscopy a powerful tool for structural investigations. These methods become rather unique if one considers the widespread availability of the required instrumentation and their applicability to disordered and amorphous materials like, e.g., thin films and Langmuir-Blodgett films which are more apt for applications than crystalline materials. 

The Langmuir-Blodgett deposition technique shows excellent promise for the assembly of films with noncentrosymmetric ordering and Coo symmetry. A system that was reported recently (3i) is shown in Figure 6.11. In this system, monolayers of the hemicyanine dye and the nitrostilbene... 

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