The ESR spectrum of NO adsorbed in Na-A zeolite was reexamined. Unlike ESR spectra of NO observed earlier with other zeolites, the ESR spectrum of NO monomer in Na-A zeolite was found to be well-defined and resolved, reflecting the compositional uniformity (Si/Al ratio of 1) of the material. The study also revealed the formation of an unusual NO-NO triplet species within the cavities.
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