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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dear Pengfei</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I did recent surface energy calculations
employing the WIEN2k and different codes and these results are published in </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Surface Science 600, 703 (2006);</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Phys. Rev. B 73, 125402 (2006);</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Phys. Rev. B 71, 195416 (2005)</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>There are several tests concerning the
convergence of the surface energy as a function of the number of layers </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In the slab and the reasons behind the
increasing of the surface energy with slab thickness.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bye</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Juarez</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
wien-bounces@zeus.theochem.tuwien.ac.at
[mailto:wien-bounces@zeus.theochem.tuwien.ac.at] <b><span style='font-weight:
bold'>On Behalf Of </span></b>MoonfalL<br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Friday, August
11, 2006</span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>9:41 AM</span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> wien<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Wien] Slab covergence</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Dear Prof. and Wien
user:
<br>
<br>
I want to test the surface energy's covergence; according to the
suggestions
<br>
at this list,I do the following
calculations:
<br>
<br>
slab with : 7 \ 9 \ 11 atom
layers
<br>
each
model in 15 \ 20 \ 25 bohr vacuum thickness
<br>
<br>
the result list
here:
<br>
<br>
E_slab
<br>
vacuum 7(layers)
9(layers)
11(layers)
<br>
15 -48168.15027 -61930.51462 -75692.87704
<br>
20 -48168.14974 -61930.51284 -75692.87596
<br>
25 -48168.14885 -61930.51269 -75692.87490
<br>
<br>
<br>
<br>
surface energy (E_slab - n*
E_bulk)
<br>
7
9
11
<br>
15 0.21361 0.23894
0.26620
<br>
20 0.21414
0.24072
0.26728
<br>
25 0.21503
0.24087
0.26834
<br>
<br>
RKM =
6
<br>
k-points
<br>
8(7*7*1)
<br>
my questions
are:
<br>
1) why the energy increases when the vacuum thickness
increases?
<br>
2) then why the surface energy insreases when the atom layers
increases?
<br>
3) then how to judge the vacuum thickness is
enough,
<br>
and the atom layers is
enough?
<br>
<br>
Can somebody give me some advices? Thanks very
much!
<br>
<br>
also I check the :VZERO, but it is too different from bulk system, tomorrow I
will give the <br>
:VZERO numerical
value
<br>
<br>
the attachments are struct files
! <br>
</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Best!</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>
Pengfei
<br>
<br clear=all>
<br>
-- <br>
-------------------------------------------------------------------------- <br>
Guan Pengfei, Ph. D<br>
Inst.f. Physics, Tsinghua U, Beijing, China<br>
Phone: +86-010-6218-2756 Mobile:
+86-138-1060-9671<br>
Email: <a href="mailto:miracle.fei@gmail.com">miracle.fei@gmail.com</a> <br>
WWW: <a href="http://www.phys.tsinghua.edu.cn">http://www.phys.tsinghua.edu.cn</a><br>
-------------------------------------------------------------------------- </span></font></p>
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