Download Advances in Catalysis, Vol. 32 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.) PDF

By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

Considering the fact that 1948, this serial has sought to fill the space among the papers and the textbooks that train the varied components of catalysis examine. This quantity contains articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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Extra info for Advances in Catalysis, Vol. 32

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Optical Properties An absorption band in the UV results from a transition between the o g and the 7cg orbitals of 0; (Fig. 2). For 0; in the alkali halides, this band is centered at about 5 eV ( f 2 2 , 123) and detailed measurements of the stress dependence have been carried out (69h). 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.

4) used throughout this review leads to the conclusion that the results are consistent with a tumbling motion about the x axis parallel to the surface rather than the spinning motion suggested by the authors. For 0; on T h o , (62),the g tensor data are consistent with rotation about the z direction, but there is some problem with the hyperfine tensor data (Section III,A,2). 0015. 025, which is observed at the same time, is in fact a signal from the same species undergoing jumps of the 0-0 group around the C-0 bond.

5. 963 which has been attributed to Ce3+ ions or to electrons in the solid. 0158 (45). Adsorption 44 M. CHE AND A. J. TENCH of 702 on either system (45, 73) indicates that both oxygens are equivalent with A,, = 75 G. This spectrum gives rise to an unusual situation because the hyperfine structure is not centered about the smallest g value as usually expected, but about the middle value of the g tensor, indicating that the nf and n: orbitals may be inverted (45). This gives rise to an inconsistency between the g and the A tensors, since both the smallest value of g and the largest value of A are expected to lie in the direction of the orbital containing the unpaired electron.

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