# What bonds are formed between O2 molecules?

So for context the question preceding this is what bonds form within O2, which I know to be covalent bonds. I am not so sure on the bonds between O2 molecules. My first thought is that the bonds would be Van der Waals interactions but I'm not sure where the interaction would come from because there is nothing to cause a dipole in diatomic oxygen. Am I just overthinking it and there wouldn't be any kind of bonding or interactions formed between O2 molecules?

Van der Waals intermolecular forces consist of

• London dispersion force between random and induced dipoles, that applies to oxygen molecules. These are the weakest.
• Debye force between permanent and induced dipoles
• Keesom force between 2 permanent dipoles. These are the strongest.

The induction of dipoles in molecules, bonds or atoms can be caused by an external large scale electrostatic field or by nearby presence of ions, permanent or temporary (random or induced) dipoles.

London Dispersion Forces will dominate for a non-polar molecule like $$\ce{O2}$$. Because electrons are constantly in motion, the molecule of $$\ce{O2}$$ can develop a temporary dipole which is the source of interaction between molecules. This type of force is weak, but with larger molecules with more electrons, this interaction becomes more significant.