<div dir="ltr">Hello Hutter,<div><br></div><div>Thank you for your reply. I will go through your suggestions.</div><div><br></div><div>Bharat </div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Nov 7, 2013 at 2:01 PM, <span dir="ltr"><<a href="mailto:hut...@pci.uzh.ch" target="_blank">hut...@pci.uzh.ch</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi<br>
<br>
periodic NDDO calculations are not a standard application.<br>
This type of application needs a lot of care and insight<br>
into the implemented methods. With other words, it will not<br>
work if you are just using defaults.<br>
There are many input options that need careful consideration,<br>
especially options in the sections<br>
&SE ... &END<br>
&POISSON<br>
&EWALD<br>
&END<br>
&END<br>
Have a look in the input files in the regtest sections.<br>
For example<br>
...tests/SE/regtest-3-4/Al2O3.inp<br>
<br>
There are also some basic algorithmic problems that are associated<br>
with the way the standard NDDO methods handle Coulomb interactions.<br>
There is one NDDO method (PNNL) that is free from this problem,<br>
unfortunately, there is no real parameter list available.<br>
<br>
To make this clear again. It only makes sense to try to use this<br>
options if you are willing to dig deep into the theory and algorithms<br>
of these simulation methods.<br>
<br>
regards<br>
<br>
Juerg<br>
<br>
--------------------------------------------------------------<br>
Juerg Hutter Phone : <a href="tel:%2B%2B41%2044%20635%204491" value="+41446354491">++41 44 635 4491</a><br>
Physical Chemistry Institute FAX : <a href="tel:%2B%2B41%2044%20635%206838" value="+41446356838">++41 44 635 6838</a><br>
University of Zurich E-mail: <a href="mailto:hut...@pci.uzh.ch">hut...@pci.uzh.ch</a><br>
Winterthurerstrasse 190<br>
CH-8057 Zurich, Switzerland<br>
---------------------------------------------------------------<br>
<br>
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To: <a href="mailto:cp...@googlegroups.com">cp...@googlegroups.com</a><br>
From: bharat<br>
Sent by: <a href="mailto:cp...@googlegroups.com">cp...@googlegroups.com</a><br>
Date: 11/06/2013 05:13PM<br>
Subject: [CP2K:4771] Semiempirical Geometry Optimization calculation with periodic boundary condition<br>
<div class="HOEnZb"><div class="h5"><br>
Hello Everyone,<br>
<br>
I am trying to perform geometry optimization calculation using semiempirical methods AM1, PM3, RM1, and PM6 with periodic boundary condition for bulk water. It is found that SCF is not converged and the structures are very bad. (O-H bond lengths increased to 5-8 A and structure is not converged.) <br>
<br>
Does anyone have experience using semiempirical methods for PBC calculation?<br>
<br>
All suggestions are appreciated. <br>
<br>
Thank you.<br>
<br>
Bharat Sharma<br>
<br>
<br>
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