When irreducible representations are given in diagrammatic form, it is possible to show direct products pictorially. By giving a similar description of the electric vector associated with a light wave, group-theoretical selection rules (the requirement of a totally symmetric direct product) can also be shown in pictorial form. The υ(CO) vibrations of Mn(CO)5Br are considered as an example; some relative band intensity conclusions arise naturally from the pictorial description.
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