EPR experiments of Ag species supported on NaA

Ag/NaA was prepared by aqueous ion-exchange of Ag + against Na + and investigated using X-band EPR spectroscopy. After hydrogen reduction, the EPR signal at a loading of 6% (wt.) exhibiting axial g- and hyperfine tensors ( g ⊥ = 1.998 and g ‖ = 2.214 , coaxial with | A ⊥ | = 23 G and | A ‖ | = 173 G) was assigned to Ag atoms. The second species is observed at 9% (wt.) Ag and is a neutral triatomic Ag cluster of near-isotropic symmetry with g iso = 2.044 and | A iso | = 97.3 G .