<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1447687695410_3184">Hello all,</div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr">I am trying to minimize the interaction between my system and its periodic images. To do so, I introduced a layer of vacuum along the z-axis by increasing the lattice vector along the z-axis by 4A. At the same time, I fixed it by using this parameter: cell_dofree='2Dxy',</div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr">But I have noticed atoms that are close to the vacuum move along the z-axis and vacuum is decreasing, is this wrong or I should use different cell_dofree?</div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr">note:relaxation still ongoing, not relaxed yet.</div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr"><br></div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr"><br></div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr">JARET,</div><div id="yui_3_16_0_1_1447687695410_3184" dir="ltr">ASU</div></div></body></html>