[gmx-users] How to control 1-5 interaction

[Makoto Yoneya]

Dear GROMACS users:

I'd like to know the proper way to control 1-5 interaction within molecule.
The 1-5 interaction which I'd like to control is as following.

        \
         CH2
           \
       H--C---O
          /        \
        CH3      C----
      atom i     ||
                   O
               atom j

Between the branched CH3 (i) and the carbonyl O (j) , there is rather strong
interaction even that is 1-5 distance.
A possible way will be as follows.

[ exclusions ]
  i    j
  j    i
[ pairs ]
  i    j     1    0.****E-02   0.****E-05  ; control this interaction
parameters

Is this correct way to control the 1-5 interaction?
Are there more adequate way?

Thank you for advance.

Makoto Yoneya Dr.
Yokoyama Nano-structured LC Project
Tsukuba, Japan