[gmx-users] Morse potential for Specific Group

[Jackson Chief Elk]

Hi,
I am building my own routine to use the Gromacs API to do MS-EVB.  I need to treat O-H bonds of 1 hydronium ion with a Morse Potential.  How can I specify in the *.mdp file, to just describe bonding in hydronium using this potential?

Thanks for you help,
Jackson