Some molecular orbitals of ethylene (point group Z>2h)- All are completely filled except l 2g in the ground state. The x axis points into the paper. [Pg.190]

Perhaps the most important feature of character tables for our purposes is that we can determine the symmetry of a product of two irreducible representations simply by looking at the products of the characters of these representations in the same point group. For example, the product of the HOMO and LUMO of ethylene transforms as B2 in E>2h, as you can see by comparing the products of the characters of Bj,g and with the corresponding characters of B2 - Alternatively, we can just note that the product of B g and Ri transforms as the product of z and yz, or yz, which [Pg.155]

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