## https://en.wikipedia.org/wiki/Chemical_bond

https://www.theochem.ru.nl/~pwormer/Knowino/knowino.org/wiki/Intermolecular_forces.html
https://en.wikipedia.org/wiki/Exchange_interaction

## https://en.wikipedia.org/wiki/London_dispersion_force

While the London dispersion force between individual atoms and molecules is quite weak and decreases quickly with separation (R) like $ \sim \frac {1}{R^{6}}$

in condensed matter (liquids and solids), the effect is cumulative over the volume of materials,[5] or within and between organic molecules, such that London dispersion forces can be quite strong

[..Eqn (86)...between two bulk solids decreases by $ \sim \frac {1}{R^{3}}$  where R is the separation between them](https://www.teokem.lu.se/fileadmin/teokem/ms6.pdf). The effects of London dispersion forces are most obvious in systems that are very non-polar 



## in amorphous solids

[the dominant contribution to inter-SRO interactions arise from  **quantum induced instantaneous dipole-induced dipole interactions (referred as dispersion forces in short) and caused by a correlated movements of electrons** in interacting molecules. In an attempt to avoid each other at short intermolecular distances, a redistribution of electrons that belong to different molecules leads to formation of instantaneous dipoles that attract each other ](https://arxiv.org/pdf/2008.12960.pdf)