hi, I am a newbie for turboTDDFT. Now, I ran a simple example. It was assume. Now I have prefix.plot_chi.dat file. then I don't know how to generate absorption spectrum from that file and dielectric constant values. As far as I understood, the absorption spectrum is related to imaginary part of average \chi value. but in the file there are 9 values chi_1_1 chi_2_1 chi_3_1 chi_1_2 chi_2_2 chi_3_2 chi_1_3 chi_2_3 chi_3_3 This is 3*3*3 tensor. how do I get an absorption spectrum and dieletric constant values? by the way S(E) means what?
Sincerely Sunghwan Choi
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