<br>Dear Pierre, <div><br></div><div>Thank you so much for the quick and informative response. I wasn't aware of SPGR and I have just checked this part:</div><div><br></div><div>*******************************************************************************<br> *** GEOMETRY OPTIMIZATION COMPLETED ***<br> *******************************************************************************<br><br> Reevaluating energy at the minimum<br><br> CELL| Volume [angstrom^3]: 334.770217<br> CELL| Vector a [angstrom]: 5.195 0.000 0.000 |a| = 5.195065<br> CELL| Vector b [angstrom]: 0.000 12.501 0.000 |b| = 12.501264<br> CELL| Vector c [angstrom]: -1.885 0.000 5.155 |c| = 5.488409<br> CELL| Angle (b,c), alpha [degree]: 90.000000<br> CELL| Angle (a,c), beta [degree]: 110.083320<br> CELL| Angle (a,b), gamma [degree]: 90.000000<br> CELL| Requested initial symmetry: MONOCLINIC<br> CELL| Numerically orthorhombic: NO<br></div><div><br></div><div>*****************************************************************************************************</div><div>Thanks for your suggestion but I don't look for phonons but the Mid-IR vibrations.</div><div><br></div><div>Kindest regards,</div><div>Mozhdeh</div><div><br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
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