Is any one know how to get van der waals radius or is that possible get it by lammps?

Please reply to the list, not to me.

You can certainly get the distance (or time-averaged distance)
between 2 atoms or 2 molecules. How you convert that to a
vdw radius would be up to you.

Steve

Please reply to the list, not to me.

You can certainly get the distance (or time-averaged distance)
between 2 atoms or 2 molecules. How you convert that to a
vdw radius would be up to you.

and that wouldn't solve the issue that the concept of a vdW radius is
that of an "effective property" derived from experimental data that is
meant to represent an averaged property.
in a force field calculation, the vdW would be directly bound to the
force field parameters via a simple geometric relation. since force
fields are not parameterized to reproduce such properties, the result
will most likely be bogus. deriving this from static calculations will
also neglect any entropic/thermal contributions.

axel.