[gmx-users] partial charge and LJ parameters for CH3 in gromos forcefields

[leila salimi]

Dear users,

I have CH3 in my molecule and in gromos force filed partial charges for CH3
is 0 (as the united atom of the GROMOS forcefield) and It doesn't consider
single H atoms,  but "includes" these H atoms into the C atoms. That means
that the CH3 group is just one LJ-bead in the GROMOS forcefield.
I need to know the charge for C and H separately, Do you know any solution
for that?
I wnat to use CP2K and as I understand correctly in CP2K I have to define
charges and LJ parameters for each atoms.
Is there any  program available to convert gromacs file to other format,
like CHARM format?

Can anybody help me with that?
Thanks
Leila