<DIV >hi everyone</DIV>
<DIV> I need to pull the two parallel monolayers together,the two monolayers are in the x-y plane , so i pull the one along the z direction,but it stay still! i tried several times ,but all failed! </DIV>
<DIV>i use the </DIV>
<DIV>[position_restraints ] <BR> 1 1 90000 90000 4000 <BR> 2 1 90000 90000 4000</DIV>
<DIV>the 1 and 2 are the atoms in the long molecules that form the monolayers ,if i decreased the fx,fy,fz,it show core fault and stopped!</DIV>
<DIV> the ; Force constants in kJ/(mol*nm^2)<BR>afm_k1 = 100000</DIV>
<DIV> who can tell me why!</DIV>
<DIV> </DIV>
<DIV>thanks !</DIV>
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