Re: [gmx-users] Control Atoms for Hydroxide ?

2009-08-18 Thread Tsjerk Wassenaar
Hi, Well, who'd need control atoms? You'd just need to position it at a certain distance along a random vector. If you're talking about it as part of a water cluster or something, technically speaking it's not a hydroxide anymore :) On another note, as I mentioned before, the proton has an

Re: [gmx-users] Control Atoms for Hydroxide ?

2009-08-17 Thread Mark Abraham
Marc Charendoff wrote: Sorry for bringing up the hydroxide ion question again, but are there any hints as to how to place a single hydrogen on the oxygen atom? Can I somehow assign control atoms outside the hydroxide anion as a means of reference for the required ffG43a1.hdb modification?