Consider the 1 CT state of p-nitroaniline whose dipole moment change is listed in Table . Although the HOMO is nominally located on the amino group and the LUMO on the nitro group, both orbitals extend over a significant portion of this small molecule, thus the CT nature of the state in question may not be immediately obvious. A Mulliken-style partition of ∆P elec and ∆P hole might help to quantify the nature and extent of the charge rearrangement. In this approach, the charge that is transferred to atom A by electronic excitation is defined as