The Hamaker constant
The Hamaker constant consists of the prefactor to
the van der Waal’s integral.
The order of magnitude of the Hamaker constant
can be estimated based on the following considerations.
For cases where the dispersion interaction is the
Recognize that rNA/M is the reciprocal of the molecular
volume and a/4pe0 is about 10% of the atomic volume.
Therefore A » 3/4p2hn(0.1)2 » 10-18 J.