[Pw_forum] constraints in the ionic dynamics

[alan chen]

Dear Stefano,
     Thank you for your comment. However my unit cell is tetragonal: the
length of x and y direction is a and the length of z direction is 20*a. I
want to fix the distance of two atoms in z direction which is larger than
a/2. 'dmax' means half the shortest edge in the unit cell, which is a/2. So
is there any better method to fix the distance of two atoms in z direction
which is larger than a/2?
     Thank you.

Hanghui
Department of Physics
Yale University
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