Hi Ashkan, Click on the title your thread or alternatively search the forum with the keyword ion and you will find detailed answers to your question.
See for example: http://www.mail-archive.com/pw_forum%40pwscf.org/msg09585.html and also the manual entry: http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PW.html#idp110032 Mostafa Youssef MIT
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