Dear all<br>
<br>
We wanted to achieve CO bond length with PBE, a GGA functional. Wien2k
gives correct bond (bond length is about 1.136 A which is comparable
with result in literature) after minimization but forces are very
large(~15 mRy/au).<br>
<br>
We have checked out many things including parameters such as RMT,
lattice parameter for unit cell, functional type (GGA and meta-GAA),
Potential cutoff and wave function cutoff (RKmax), SO effect, and
also we've used different Wien2k version(2005-2006), precompiled
version and source code. We've used Fedora Core 4 as OS and our machine
was intel em64t.<br>
<br>
we would like to know, is our calculation safe?<br>
<br>
Best regards<br>
<br>
Hojjat Gholizadeh<br>
<br>