Hi,<br>how do you come to this conclusion ? The symmetry operation of nanotubes should depend on their chiral indexs..<br><br><div class="gmail_quote">On Sat, Jul 5, 2008 at 7:21 PM, zahra sadat naghavi <<a href="mailto:szs_naghavi@yahoo.com">szs_naghavi@yahoo.com</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top">
<p>Dear all !</p>
<p>Armchairs and Zigzags nanotubes have 24 symmetry oprerations.<i>of course it is important that in which latticce they are located </i>but in Hexagonal we expected 24 symmetrys for (6,6) but pw.x does not distinguish horizental mirror planes and talk about only 12.</p>
<p>can anybody help? </p>
<p> </p></td></tr></tbody></table><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Hai-Ping Lan <br>Department of Electronics ,<br>Peking University , Bejing, 100871<br><a href="mailto:lanhaiping@gmail.com">lanhaiping@gmail.com</a>, <a href="mailto:hplan@pku.edu.cn">hplan@pku.edu.cn</a>