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</font></span><p><span style="font-family: arial, sans-serif;"><font size="2">Hi<span lang="zh-CN">,</span>everyone<span lang="zh-CN">!</span></font></span></p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><p><span style="font-family: arial, sans-serif;"><font size="2">I try to calculation the
molecular orbitals (MOs) of a semiconductor. my
calculations produced
a series of <code class="western">cube</code>
files of MOs.</font></span></p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><p><span style="font-family: arial, sans-serif;"><font size="2"><a name="tw-target-text"></a><a name="tw-target-text1"></a><a name="tw-target-text2"></a>
HOMO and LUMO energy
are <span lang="en-US">close
to the values in article </span>but
the HOMO-LUMO gap is very smaller than experimental values.</font></span></p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><p><span style="font-family: arial, sans-serif;"></span><span style="font-family: arial, sans-serif;"><font size="2"><br></font></span>
</p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><p><span style="font-family: arial, sans-serif;"><font size="2">calculated gap = 2.840 ev</font></span></p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><p><span style="font-family: arial, sans-serif;"><font size="2">experimental = 6 ev</font></span></p><span style="font-family: arial, sans-serif;"><font size="2"></font></span><span style="font-family: arial, sans-serif;"></span><span style="font-family: arial, sans-serif;"></span><span style="font-family: arial, sans-serif;"></span><p>
<span style="font-family: arial, sans-serif;"><font size="2"><br></font></span>
</p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><p><span style="font-family: arial, sans-serif;"><font size="2">can anyone give me some
suggestions about my calculation? attached are my input and output
files.</font></span></p><span style="font-family: arial, sans-serif;"><font size="2">
</font></span><style type="text/css"><span style="font-family: arial, sans-serif;"><font size="2">p { margin-bottom: 0.1in; line-height: 120%; }code.cjk { font-family: "Nimbus Mono L", monospace; }</font></span></style></div>