<div dir="ltr"><div>Dear Natalia:</div><div>If I understand right, under the</div><div></div><div><br></div><div>&GLOBAL<br> PROJECT Ag6<br> RUN_TYPE RT_PROPAGATION<br> PRINT_LEVEL LOW<br>&END GLOBAL</div><div><br></div><div>you do not compute properties of UV optical transitions </div><div>but a dielectric response in the ground state.</div><div><br></div><div>Victor<br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 10, 2023 at 11:55 AM Natalia K <<a href="mailto:natalja.lipina@gmail.com">natalja.lipina@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Dear community,</div><div><br></div><div>I am calculating the absorption spectra for a silver chain using both linear response (TDDFPT) and real-time propagation implemented in CP2K 9.1. Within the RT propagation, I apply a delta kick in all three directions and then take the Fourier transform of the dipole moment and get the average (over three directions) spectrum that is in a very good agreement with the literature. In particular, with another GGA linear-response calculation with the Gaussian code (image attached, top - my results, bottom - reference). Within the TDDFPT approach, I calculate the oscillator strength which should give the same frequencies as the real-time approach, but it doesn't. In the figure attached, the oscillator strength is plotted with impulses. I tested many different parameters but LR never agrees with RT. I also tested a simpler system, a water molecule, and got a better agreement between the two methods, but still not as perfect as here, for instance: <a href="https://nwchemgit.github.io/RT-TDDFT.html#absorption-spectrum-of-water" target="_blank">https://nwchemgit.github.io/RT-TDDFT.html#absorption-spectrum-of-water</a></div><div><br></div><div>I would appreciate any help or suggestion. I attach both RT and LR input files used to obtain the results on the figure.</div><div><br></div><div>Best regards,</div><div><br></div><div>Natalia<br></div>
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