Effect of spin flip-flop on electron-spin-echo decay due to instantaneous diffusion |
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| Affiliation: | 1. Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama, Toyonaka, Osaka 560–8531, Japan;2. Institute for Chemical Research, Kyoto University, Gokasho, Uji-city, Kyoto 611-0011, Japan;1. Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, Strasbourg, France;2. Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany |
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| Abstract: | The effect of electron spin flip-flop on two- and 2 + 1-pulse electron-spin-echo decay due to instantaneous diffusion was studied on hydrogen atoms in y-irradiated quartz. The observed decay was slower than the theoretical decay including no spin flip-flop, and the discrepancy increased with the concentration of the hydrogen atoms. A comparison of the theoretical and the experimental decay rates revealed that the main factor diminishing the effect of instantaneous diffusion is not the direct flip-flop between on-resonant spins, but the fluctuation of the local magnetic fields for on-resonant spins due to the flip-flop of adjacent spin pairs. |
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