The paramagnetic oxygen molecule is the dominant source of 29Si spin–lattice relaxation in zeolites with intracrystalline water playing a much smaller part; n.m.r. signals corresponding to crystallographically non-equivalent sites relax at different rates in the vicinity of sorbed oxygen.
J. Klinowski, T. A. Carpenter and J. M. Thomas, J. Chem. Soc., Chem. Commun., 1986, 956 DOI: 10.1039/C39860000956
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