<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV><FONT face=Verdana><FONT size=2>Hello everybody:</FONT></FONT></DIV>
<DIV><FONT face=Verdana size=2> I have read GROMACS' manual and found that the non-bond interaction in GROAMCS is describled as Coulomb term add A/r^12 -B/r^6 which is named Lennard-Jones term, but recently I have read some papers which use a effective-two-body potential to describle the non-bond interaction in the GROAMCS MD simulation, and this potential works much better in dealing with transition metal ion-water system, in this potential, non-bond interaction between ion and O atom in water molecular is describled as follow:</FONT></DIV>
<DIV><FONT face=Verdana size=2> V(r)=A/r^4+B/r^6+C/r^8+D/r^12+E*exp(-F*r)+coulomb term; </FONT></DIV>
<DIV><FONT face=Verdana size=2>where the A,B,C,D,E and F are parameters which can be obtained by fitting the potential energy surface calculated from Ab initio method. r is the distance between the ion and O atom in water molecular, the interaction between the ion and H atom in water molecular has the similar form.</FONT></DIV>
<DIV><FONT face=Verdana size=2> So my question is how to modify the GROAMCS in order to simulate dynamic course by using this new potential instead of the default L-J interaction. I have tried to find the solution in internet, but so far I still have no idea on this problem, can anybody help me on this problem, I will be very, very grateful for your help.</FONT></DIV>
<DIV><FONT face=Verdana size=2> My English is not good, please forgive my awkward expression. </FONT></DIV>
<DIV><FONT face=Verdana size=2> Best Wishes!</FONT></DIV>
<DIV><FONT face=Verdana size=2> Ye Qing</FONT></DIV>
<DIV><FONT face=Verdana size=2> 09.09.15</FONT></DIV></td></tr></table><br>
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