<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><pre style="line-height:17.5pt"><span lang="EN-US" style="font-family:"Cambria","serif";mso-ascii-theme-font:major-latin;
mso-hansi-theme-font:major-latin">Dear </span><span lang="EN-US" style="font-family: Cambria, serif;">Giuseppe</span></pre>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">I see. Thank
you for your kind reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">Fei Mao<o:p></o:p></span></p><br><br><br><br><div style="position:relative;zoom:1"></div><div id="divNeteaseMailCard"></div><br><pre><br>At 2016-06-10 18:02:59, "Giuseppe Mattioli" <giuseppe.mattioli@ism.cnr.it> wrote:
>
>Dear Evan (sign always with full name, please)
>
>You are not simulating an insulator LiF, you are simulating a LiF with an interstitial H that add one electron to the system, so that you have an even
>number of electrons. But you required a closed shell calculation. The code is not able to fit the excess electron in a closed shell orbital if you do
>not permit the treatment of the system as a "metal" by using one of the flavours of occupations='smearing'. You might also want to consider if nspin=2
>is more suitable in your case.
>HTH
>Giuseppe
>
>On Friday, June 10, 2016 04:20:55 PM evan wrote:
>> Dear all,
>>
>> I am performing geometry optimization calculations on insulator LiF. For insulators with a gap, I read from the variable document and set
>> âoccupations = fixedâ in the input file (attached). However, at the end of one BFGS optimization step (contains 15 scf iterations), the error is
>> followed (also attached):
>>
>>
>>
>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>>
>> Error in routine electrons (1):
>>
>> charge is wrong: smearing is needed
>>
>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>>
>>
>>
>> The error is self-explained, and it can be fixed by âoccupations = smearingâ, but it is conflict with what is said in the document.
>>
>> So, how to fix the problem. Your comments or suggestions are much appreciated.
>>
>> Regards
>>
>> Evan
>>
>> University of South China, China
>
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> Giuseppe Mattioli
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