<DIV><FONT size=4>hi all</FONT></DIV>
<DIV><FONT size=4> as i use the l-bfgs to optimize my system ,which composed of two monolayers that each contain 36 CH3(CH2)14COOH molecules ,when the distance bettwen the two monolayes is 1.5nm,the minimization go smoothly,but when decrease to 1.2nm,the monilayers turn over(A-B:B-A TO B-A:A-B,A B are the tail groups),but when i increase the molecules from 36 to 108,the monolayers also turn over at 1.5nm.and the mdp is </FONT></DIV>
<DIV>rlist = 0.9<BR>rcoulomb = 0.9<BR>vdwtype = shift <BR>rvdw-switch = 0.7<BR>rvdw = 0.8</DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT size=4>do the non-bond cause the problem? </FONT></DIV>
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