In discussions of dipole effects, two important limits are usually encountered. 1.625 Debye = 0.6393 a.u. (1 atomic unit  𝑒𝑎 , 𝑒 is the elementary charge and 𝑎 the Bohr radius) is the critical value of the dipole moment necessary to bind an electron in a fixed dipole field. Molecular rotation increases the dipole binding threshold, and a more realistic limit is generally accepted to be about 2.4 Debye (0.94 a.u.). However, the ability to support a dipole bound state is not a requirement for the PADs to be affected, a fact that is often overlooked when considering detachment from anions.