H2 and He2 - The Simplest Examples

The stabilisation and destabilisation energies, AE and AE2, depend on the overlap between the AOs. The closer the two atoms approach each other, the larger the overlap and the larger the energy splitting. This effect can be tested using demonstration 1. 

Interactive MO scheme for H2 and He2i orbitaJ contours, and energies and bonding energy for two or four electrons as a function of distance. 

---