<div dir="ltr">Dear Sir,<br><div><div class="gmail_extra">If I don't mention asr='zero-dim' in the input section then also I am not getting the frequencies correctly. Now I am getting the following frequencies<br>
<br>--------------------------------------<br># mode [cm-1] [THz] IR<br> 1 -132.06 -3.9590 0.1498<br> 2 -131.77 -3.9503 0.1486<br> 3 -109.35 -3.2782 0.0031<br> 4 -108.74 -3.2599 0.0032<br>
5 91.54 2.7443 0.0511<br> 6 127.22 3.8141 0.0142<br> 7 153.76 4.6095 0.0003<br> 8 164.03 4.9174 5.4586<br> 9 164.06 4.9185 5.4543<br> 10 190.74 5.7182 4.0762<br>
11 191.78 5.7493 0.0010<br> 12 191.95 5.7544 0.6314<br> 13 380.90 11.4192 0.0000<br> 14 395.35 11.8522 0.0004<br> 15 397.38 11.9132 0.0001<br> 16 410.55 12.3081 0.0022<br>
17 412.54 12.3677 0.0019<br> 18 420.67 12.6114 0.0001<br> 19 1398.48 41.9255 0.0328<br> 20 1407.66 42.2007 5.2353<br> 21 1408.10 42.2137 5.5635<br> 22 1414.41 42.4029 0.0151<br>
23 1414.84 42.4158 0.3427<br> 24 1435.81 43.0446 7.0296<br> 25 1635.17 49.0210 0.0000<br> 26 1666.27 49.9536 0.0000<br> 27 1685.50 50.5300 0.0001<br> 28 1686.11 50.5484 0.0000<br>
29 3052.32 91.5064 0.5011<br> 30 3066.46 91.9303 3.0260<br> 31 3082.41 92.4082 45.2275<br> 32 3086.97 92.5451 19.4732<br> 33 3091.92 92.6934 41.1318<br> 34 3095.54 92.8020 33.9297<br>
35 3103.29 93.0342 38.8619<br> 36 3154.67 94.5747 67.2231<br>--------------------------------------------------------------------<br><br></div><div class="gmail_extra">Thanking you.<br>Pratik<br></div><div class="gmail_extra">
<br><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
On Fri, 2014-05-02 at 14:09 +0530, Saied Md Pratik wrote:<br>
<br>
> NH4Br crystal<br>
<br>
> asr='zero-dim'<br>
<br>
if it is a real crystal, you shouldn't use 'zero-dim'.<br>
If it is a molecule in a supercell, you may have unstable<br>
(and physically irrelevant) libration modes<br>
<br>
> celldm(1) = 1.890359168<br>
<br>
putting into celldm(1) the a.u. to A conversion factor<br>
is a bad habit in my opinion, and ot doesn't make sense<br>
if you specify your cell vectors in A:<br>
<br>
> CELL_PARAMETERS angstrom<br>
> 5.633079685 0.000000000 0.000000000<br>
> 0.000000000 5.633079685 0.000000000<br>
> 0.000000000 0.000000000 3.982678150<br>
<br>
P.<br>
<br>
--<br>
Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone +39-0432-558216, fax +39-0432-558222<br>
<br>
<br></blockquote></div></div></div></div>