<br>Dear
Mario,<div> </div><div><div>Thank you very much for your help. In fact, I have just started using cp2k software. I have a question before you reply to me, that is why there is no *dat file in my output files. But now I understand that I need to add the 'FILENAME output' keyword in the 'MOMENTS' subsection.</div><div><br></div><div>Still, I have one question to ask you: What does the value of 'STEPS' in the 'MD' section of rt-TDDFT specifically mean? The interpretation of the official website is ambiguous. To calculate the spectra of different systems, do you have any suggestions for setting the STPES and TIMESTEP keywords?</div></div><div><br></div><div>Best wishes,</div><div><br></div><div>Lin</div><div class="gmail_quote"><div dir="auto" class="gmail_attr">在2020年7月11日星期六 UTC+8 上午2:29:44&...@student.uva.nl> 写道:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div dir="ltr"><div>Dear Lin,</div><div><br></div><div>I am not at all an expert on the issue, but I do have this example file online. Also once you obtain the dipole moment as a function of time, you can perform a Fourier transform of the data. I have attached a python script to transform the data. Make sure it works properly yourself and make sure you read about why this works :-). The output you want for the spectrum should be called something like ch2o_pbe_rtp-output-moments.dat. I tried this for quantum dots and it didn't work. Maybe different timestep and basis/ potential are needed. Also, I don't know if the script can handle these small numbers. </div><div><br></div><div>Good luck,</div><div><br></div><div>Mario</div><div><br></div><div><br></div></div><br><div class="gmail_quote"></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 10, 2020 at 4:03 PM lin xiong <<a href data-email-masked rel="nofollow">xio...@gmail.com</a>> wrote:<br></div></div><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"><div dir="ltr"><blockquote style="margin:0px 0px 0px 40px;border:medium none;padding:0px"></blockquote>Hi all,<br> <br><blockquote style="margin:0px 0px 0px 40px;border:medium none;padding:0px"></blockquote> Recently I learned that cp2k code has two ways to calculate the absorption spectrum, namely real time propagation TDDFT and TDDFPT. I would like to ask some questions about using rt-TDDFT to calculate the spectra.<div><br><div> 1. First of all, I would like to ask if my input file is correct? If the input file is correct, then there are two additional questions: 2. In which file (as shown in the figure below) is the data used to draw the spectrum stored? 3. How to use these data to plot the spectrum? </div></div><div><br></div><p style="text-align:center;clear:both"><img src="https://groups.google.com/group/cp2k/attach/10bc5f7cc4f80/25.jpg?part=0.0.1&view=1" alt="25.jpg" style="margin-left:1em;margin-right:1em" title="" width="320" height="113"></p><div><br></div></div>
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