<div dir="ltr"><div>Hi Stephen</div><div><br></div><div>I recently used the small displacement method to calculate the ZPE of adsorbed molecules:</div><div><br></div><div><span lang="EN"><p align="JUSTIFY" dir="LTR">I. G. Shuttleworth, <i>Applied Surface Science </i><b>378 </b>(2016) 286-292</p>
<p align="JUSTIFY" dir="LTR">DOI: 10.1016/j.apsusc.2016.03.173</p><p align="JUSTIFY" dir="LTR"><br></p><p align="JUSTIFY">It was implemented using QE and Dario Alfe's PHON package - ref [23] in the above paper.</p><p align="JUSTIFY"><br></p><p align="JUSTIFY">Hope this helps,</p><p align="JUSTIFY"><br></p><p align="JUSTIFY">Ian</p></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 24, 2017 at 8:24 PM, Nicola Marzari <span dir="ltr"><<a href="mailto:nicola.marzari@epfl.ch" target="_blank">nicola.marzari@epfl.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
<br>
1) try with a small system (one molecule, CO or H20) on<br>
some inexpensive metal (e.g. Al) - 3 layers, small surface<br>
cell<br>
<br>
2) calculate phonons as you do with QE, following some tutorials<br>
<br>
3) compare with what you get by moving the molecular atoms by hand,<br>
and diagonalizing that sub-dynamical matrix<br>
<br>
4) try with and without a vdW functional<br>
<br>
5) look at Ismaila's 2007 JACS<br>
<br>
nicola<br>
<br>
<br>
<br>
On 24/05/2017 18:28, <a href="mailto:weitzner@psu.edu">weitzner@psu.edu</a> wrote:<br>
> Dear QE experts,<br>
><br>
> I am interested in calculating adsorption energies of atoms and<br>
> molecules on noble metal surfaces as a simple exercise, but I am<br>
> uncertain about the logistics of how to efficiently and accurately<br>
> compute the zero point energies of adsorbed species on a slab using<br>
> DFPT. I understand how the zero point energy is computed and how to<br>
> account for its effects in the adsorption energy, but I am admittedly<br>
> not very knowledgable about the subtleties of performing phonon<br>
> calculations for surfaces.<br>
><br>
> I was wondering if somebody could provide some suggestions or kindly<br>
> point me to some references for how to go about performing these kinds<br>
> of surface phonon calculations for looking at adsorption phenomena?<br>
><br>
> Any assistance would be greatly appreciated. Thanks for your time.<br>
><br>
> Best regards,<br>
> Stephen<br>
><br>
> ––<br>
> Stephen Weitzner<br>
> PhD Candidate<br>
> Department of Materials Science and Engineering<br>
> N-234 Millennium Science Complex<br>
> The Pennsylvania State University<br>
> University Park, PA 16802<br>
><br>
><br>
><br>
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--<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
Prof Nicola Marzari, Chair of Theory and Simulation of Materials, EPFL<br>
Director, National Centre for Competence in Research NCCR MARVEL, EPFL<br>
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