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<P>Hi, all:</P>
<P>To make the simulation under a more natural environment, maybe, some NaCl
molecules are needed to add into water solvent.</P>
<P>My question is whether this step is necessary? and how many Na and Cl ion
pairs should be added?</P>
<P>This problem is probably a little silly, but I do wanna know about the
answer!</P>
<P>Your help will be greatly appreciated!</P>
<P> </P>
<P>Regards</P>
<P>Xie YH</P>
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