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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Ashkan,<br>

<br>

Click on the title your thread or alternatively search the forum with the keyword ion and you will find detailed answers to your question.<br>

<br>

See for example:<br>

<br>

<a href="http://www.mail-archive.com/pw_forum%40pwscf.org/msg09585.html" target="_blank">http://www.mail-archive.com/pw_forum%40pwscf.org/msg09585.html</a><br>

<br>

<br>

and also the manual entry:<br>

<br>

<a href="http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PW.html#idp110032" target="_blank">http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PW.html#idp110032</a><br>

<br>

<br>

Mostafa Youssef<br>

MIT<br>

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