Séminaire

Mardi 12 Juillet 2016 à 11h00.

Particle spectroscopy: size, shape and interaction effects

''Inelastic light scattering is widely used for the study of the acoustic vibrational dynamics of nano-particles. For small particles d ensity of the observed peaks is size-dependent. These studies laid the foundation of the particle vibration spectroscopy, the acoustic analogue of the molecular vibration spectroscopy, as resolved eigenmodes are considered fingerprints of the particles' shape, size and composing materials In this talk I will review the theory which allows evaluating the optical activity of the normal modes of vibration and I will apply it in order to study the selection rules in spheroidal particles. Knowing the nature of the principal modes of spheroids is of the outmost relevance also for understanding the phononic dispersion in the colloidal structured which can be assembled from them, a precondition to the design of efficient phononic crystals.''