can be understood in terms of the energy of the dipole mo-
London dispersion force The van der Waals force is the term used to
van der Waals (vdW) dispersion interactions play an important role in the structure
(iii) When perturbation theory is applied to the problem in second order, it is
In multiplying out (xAxB+ yAyB−2zAzB)2, the cross terms will have expectation values of zero.
Ab initio Methods II: Electron Correlation Methods (CI and perturbation theory)
which permit the reliable evaluation of second order long range interactions.
Notably among the non-covalent interactions, van der Waals (vdW)
is a second order term because the sum of the orders of ˆH
The van der Waals (vdW) equation of state has long fascinated researchers