Electron wave packet modeling of chemical bonding: Floating and breathing minimal packets with perfect-pairing valence-bond spin coupling

► We examine a simple wave packet modeling of electrons in chemical bonding. ► In particular, we employ floating and breathing minimal Gaussian wave packets. ► The antisymmetry is dealt with by non-orthogonal perfect-pairing valence-bond theory. ► The model is found to give accurate potential energy surfaces of small molecules. ► A simple core pseudo-potential properly models core-valence interactions.