An ESR Study of Nitric Oxide Adsorbed on Silica Gel

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Abstract
Nitric oxide adsorbed on silica gel was investigated by ESR. It was found that there are at least two adsorption sites for nitric oxide; one of them is on the silica gel which has been pretreated at low temperatures (below ca. 500 °C) (Site L), while the other is predominantly on the silica gel which has been pretreated at high temperatures (above ca, 500 °C) (Site H). The crystal-field splitting of the Πx* and ΠY* states, which are originally degenerate, was determined to be 0.26 eV for the nitric oxide adsorbed on Site L and 0.52 eV for the nitric oxide on Site H. The temperature dependence of the ESR spectrum was also examined, and the average crystal field acting on nitric oxide was found to decrease with an increase in the temperature.
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