Abstract
A new ESR signal has been observed in γ-irradiated Y-type zeolite, the Na + ions of which have been exchanged by divalent cations such as Mg 2+ or Ca 2+. Its ESR parameters are as follow: g 1 = 2.0065 and g 2 = 2.0060 and g 3 = 2.0021 ± 0.0002 and C 1 = 41, C 2 = 42.5 and C 3 = 73 ±0.5 Oe for MgY samples and g 1 = 2.0063, g 2 = 2.0060 and g 3 = 2.0021 ± 0.0002 and C 1 = 40, C 2 = 42 and C 3 = 74 ± 0.5 Oe for CaY samples. The signal is a triplet and the corresponding hyperfine structure is shown to be due to the interaction with two hydrogen nuclei. The signal is assigned to an H 2O − ion adsorbed on the divalent cation and formed according to the reaction: Me(OH) + + H . → Me 2+ … (H 2O) −. The Me(OH) + corresponds to the 3685 cm −1 IR band and the H atom to the ESR doublet with 1.4 Oe linewidth arising from structural acidic OH groups giving the 3550 cm −1 IR band.
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