Abstract

Picosecond time dynamics of the isotropic as well as the anisotropic transient absorption saturation have been measured in an α-sexithyenil (T 6 ) thin film at room temperature by photoinduced absorption and resonant Kerr-gate experiments. Strongly damped photoacoustical oscillations have been detected superimposed on the photobleaching signal, providing a way to evaluate the sound speed in T 6 films along the normal to the substrate; V S ≃16 A/ps

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