Atomic electronic transitions assignment

Unambiguous assignments of the band maxima of the allowed electronic transitions are only possible for the longest-wavelength bands of ions with Td and C3p symmetry. However, all bands of Table 1 of Chapter 16.1 can be assigned qualitatively to metal reduction transitions (from MOs with predominantly ligand character to ones essentially localized on the central atom). Empirically, this... 

Assignments are made for the electronic transitions corresponding to the A1 metal atom, its dimer, the insertion product of A1 and H2O (HAIOH), and the HAIOH photolysis products AlO and AlOH. AI2 shows a (0,0) transition at 4049 8 with an average of 252 cm l. HAIOH displays a very... 

Molybdenum is in Sub-Group VI A/B of the Periodic Table, and in the second series of transition elements. Transition elements are those which have an incomplete inner orbit in their atomic structure (see Table 3.1), and such an incomplete orbit is less stable than a filled orbit. The result is that the transition elements, and their compounds, show resemblances to each other and peculiarities in comparison with non-transition elements. It is therefore interesting that a number of compounds of other transition elements have been studied for solid lubricant use, and some of them have been found to be very effective, but no-one has yet shown any particular relationship between transition element structures and lubricating performance. The electron orbital assignments for these various elements are shown in Table 3.1. 

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