Reaction of Positronium with Proton in Ultra-stable Y Zeolite Studied by Positrons

The positron annihilation lifetime spectra were measured as a function of the heating temperature for the ultra-stable Y (USY) zeolites. The lifetime spectra were well resolved into five lifetime components, and the longer lifetimes т₃, т₄ and т₅ are assigned to ortho-positronium annihilating in the β-cage, super-cage and the second pore in USY zeolite, respectively. The interesting observation is that the annihilation rate λ₅ (the reciprocal of The т₅) of the fifth component increases and its intensity I₅ decreases with the increasing heating temperature. The result is interpreted in terms of the increase in proton and the reaction between the positronium and proton in USY zeolite after heated.