Critical Binding of an Electron to a Rotationally Excited Dipolar System

Calculations are made of the minimum dipole moments necessary to bind an electron to a nonstationary finite electric dipole in a number of rotationally excited states. The critical moment for a given dipolar system is found to depend on the dipole length, the moment of inertia, and the rotational quantum state of the finite dipole. The properties of the dipolar system are discussed as to their implications for electron scattering by polar molecules.