Diffusion 2 Diffusion in solids 2 Esters 2 Glass 2 Glass transition 2 Ground state 2 Ground-state molecules 2 Irradiation 2 Molecules 2 Photobleaching 2 Polarized fluorescence 2 Poly(ethyl methacrylate) 2 Poly(methyl methacrylate) (PMMA) 2 Polybutylmethacrylate 2 Polymer films 2 Polymethyl methacrylates 2 Rotational diffusion 2 Rotational diffusion coefficients 2 Rotational dynamics 2 Semiconducting films 2