Fluorescent spectroscopy is used to demonstrate the effect of vitrification of the surface layer of polystryene on the mobility and dimerization of probe molecules in the layer. The results of this work agree well with the data obtained earlier using an independent technique.
$^1$Department of General Physics and Molecular Electronics, Faculty of Physics, Moscow State University, Leninskie gory, Moscow, 119992, Russia
$^2$Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117915, Russia