<html><head></head><body><div class="ydp3ccc8dafyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div>Dear QE users, </div><br>I have to calculate the optical properties of a silicon unit cell, but I'm completely new to it.. <br><br>I performed the SCF calculation with gamma K points (as in the hands on: https://gitlab.com/QEF/q-e/-/tree/develop/TDDFPT/examples/example02), and the Lanczos calculation with the following parameters: <br><br><font size="2">&lr_input<br>prefix = 'silicon'<br>outdir = './outdir'<br>/<br><br>&lr_control<br>itermax = 1000<br>ipol = 4<br>/</font><br><div><br></div><div dir="ltr" data-setdir="false">After, I ran the Turbo_Spectrum which created the silicon.plot_S and the plot_chi. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I would like to plot the absorption data for the directions [001] [010] [100], what should I do to get the data to create these plots?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Besides, Where can I find the real and imaginary parts of the dielectric function in the files created to plot these data?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks for your help!</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">José Xavier</div><div dir="ltr" data-setdir="false">UFRN</div><div dir="ltr" data-setdir="false"><br></div></div></body></html>