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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear PW users,<br>
<br>
I would like to relax my system while keeping some geometry constraints.<br>
<br>
Specifically, I have a linear chain composed of N atoms (say A,B,C).<br>
I want to know if it is possible to relax the distance among atoms only (so AB, BC and CA)<br>
while making sure that the system stays linear after the relaxation.<br>
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Following the PW doc: <a href="http://www.quantum-espresso.org/wp-content/uploads/Doc/pw_user_guide/node11.html" target="_blank">
http://www.quantum-espresso.org/wp-content/uploads/Doc/pw_user_guide/node11.html</a><br>
I have tried with <tt>calculation='relax'</tt> and add namelist &IONS,<br>
but it looks like there is no relaxation at all.<br>
<br>
Thank you,<br>
<b>Marco Di Gennaro</b><font color="808080">,</font> <font color="808080">Dr.</font><br>
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<div style="font-family:Tahoma; font-size:13px"><font color="808080">Nccr MARVEL - University of Basel<br>
Phone +41 61 267 3846<br>
Klingelbergstrasse 80, Office 5.10<br>
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