<div dir="ltr"><div>Hi,</div><div><br></div><div>i) No. A mass-weighted normal mode is the eigenvector of mass-weighted Hessian, which is not useful from a user's point of view. Most of the frequency calculation programs print mass-unweighted normal modes, but CFour is an exception.</div><div><br></div><div>ii) If I understand you correctly, you are asking whether the above mass-unweighted normal modes are renormalized to 1.0.</div><div>The answer depends on the programs. In Gaussian and Q-Chem: yes; Molpro and GAMESS: no.</div><div><br></div><div>To better understand the three kinds of normal modes, please see the source codes of my UNIMOVIB program</div><div><a href="https://github.com/zorkzou/UniMoVib">https://github.com/zorkzou/UniMoVib</a></div><div><br></div><div>Best,</div><div>Wenli</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 21, 2017 at 3:17 PM, 김소연 <span dir="ltr"><<a href="mailto:syzoo@kaist.ac.kr" target="_blank">syzoo@kaist.ac.kr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">Dear molpro user</p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px"> </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">I have some questions about calculation procedure for molpro's vibrations and normal modes. </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">I couldn't find the related papers or documents. </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px"> </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">The questions are, in molpro,</p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">i) Vibrational frequency is, of course, mass-weighted. Is normal mode also mass-weighted, or not?</p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">ii) Normal mode coefficients (cartesian internal displacement) from output file correspond to one quantum eigenvector, or scaled? </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px"> (for example, in Gaussian, normal mode vectors are scaled to make sum of the wquares of the cartesian displacements is 1.) </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px"> </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">I hope to be advised on these questions.</p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">And, in fact, i wanna know the whole calculation procedure for vibrational normal mode.</p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">if you have some related documents or any other things, please share it with me. </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px"> </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">Thank you. </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px"> </p><p style="line-height:1.2;font-family:돋움;font-size:11pt;margin-top:0px;margin-bottom:0px">So-Yeon Kim </p>
<br><p>So-Yeon Kim</p>
<p>Integrated Master's_Ph.D program<br>Chemical Dynamics & Nano-microscopy Lab.(CDNL)<br>Department of Chemistry, KAIST<br>Daejeon, 305-701, Republic of Korea<br>Mail) syzoo<a href="mailto:syzoo@kaist.ac.kr" target="_blank">@kaist.ac.kr</a></p>
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