Abstract
Room temperature oxygen adsorption on high purity MgO specimens of high surface area, has been studied by ESR. On adsorbing oxygen, MgO samples activated in vacuo (š 10 −5 torr) in the temperature range 873–1173K develop a weak ESR signal corresponding to about (1–3) × 10 14 spins m −2. If, however, the sample is first exposed to H 2, CO or C 2H 4 at 295 K, and then to O 2, a strong ESR signal (up to 3.3 × 10 15 spins m −2) is observed. This signal is due to (O − 2) s species. The enhanced surface reactivity of MgO specimens upon room temperature treatment with reducing gases is discussed and a model of the electron donor centre for (O − 2) s formation is proposed.
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