By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
Seeing that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various components of catalysis study. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Additional resources for Advances in Catalysis, Vol. 32
In some cases the situation may be more complicated if the axes of the g and A tensors do not coincide, but this is difficult to measure for powder systems. When spin densities are calculated, it is important to remember that motion of the 0; may substantially decrease the values below unity, and caution must be taken not to draw conclusions on the presence of covalent bonding between oxygen and the surface unless it is clear that motion is not present. In this respect, the direct observation of inequivalent oxygen nuclei and of superhyperfine interactions (Section 111,A,3) is a better guide.
A yellow luminescence in alkali halides has been known for many years (124) but was not identified as originating from 0; until 1961 (122). At low temperature, the emission spectrum in both alkali halides (125)and sodalites (126)shows a number of sharp zero phonon transitions between 400 and 600 nm; the spacing of these lines corresponds to the ground-state vibrational frequency of the 0; ion. The Ag'O; complex has been observed (127a)in a matrix experiment and gives an absorption at 275 nm. Although well documented in the solid state, no optical absorption or luminescent spectra have been reported for 0; on an oxide surface even where EPR has shown the ion to be present on, for example, zeolites (127h) or the alkaline-earth oxides (128, 129).
1 ) previously assumed as characteristic of the peroxide ion in the alkaline-earth oxides (21)is incorrect and the bands probably arise from a superoxide impurity. Davydov et al. (149a) have reported IR observations of a negatively charged oxygen species formed when oxygen is adsorbed on chromic oxide absorbing at a frequency of 985 cm-'. The molecular nature of this species was confirmed by isotopic labeling and it was found to convert to an atomic form when the reaction temperature was increased to 200°C.