Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract Positron lifetime spectra were re-measured for a series of synthetic zeolites using a large time window of observation. Magnetic quenching experiments were also performed for the zeolites, and it has been confirmed that both the λ4 and the λ3 components are due to o-Ps. The annihilation rate of the third component, λ3, showed a good correlation with the size of the largest voids, which is similar to the correlation reported for other compounds. However the annihilation rate of the longest-lived component, λ4, showed a poor correlation with the void size. The λ3 component has thus been assigned to o-Ps in the regular voids of the zeolites, and the λ4 component to that escaped to inter-particle open spaces.
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