[gmx-users] improper dihedral convention

[Parvez Mh]

Dear All:

I want to apply OPLS-UA improper dihedral to fused benzene ring. I am
confused with sequence of atoms. I went through manual 4.6.7,page 79, I
have confusion.

              *   l*
                 |
                 |
                * i*
                /  \
               /    \
              /      \
         *   i         k     *

I do not know if it is typo or correct, in manual, it use 'i' twice.
I never used improper, but what makes sense to me central atom should have
certain sequence.

Regards
Masrul