  The studies of chemical processes in spatially confined conditions are of
interest from the fundamental and industrial points of view. By means of the W
band EPR and 1H Mims electron nuclear double resonance (ENDOR) we show that the
radiation-induced paramagnetic centers (E') in the synthetic nanoporous silica
opals could be used as sensitive probes to investigate the surface modification
and, potentially, reactions of polymerization in the confined by opal pores.
