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<p>Dear QE users,</p>
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<p>Now, I use the turbo_lanczos.x and turbo_spectrum to get the <span>absorption spectrum.</span></p>
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<p>I can get a plot_chi.dat file, as follow:</p>
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<div>#Chi is reported as CHI_(i)_(j) \hbar \omega (Ry) Re(chi) (e^2*a_0^2/Ry) Im(chi) (e^2*a_0^2/Ry) </div>
<div># S(E) satisfies the sum rule </div>
<div> chi_1_1= 0.000000000000000E+00 0.189914943334197E+04 0.000000000000000E+00</div>
<div> chi_2_1= 0.000000000000000E+00 -.949575309581559E+03 0.000000000000000E+00</div>
<div> chi_3_1= 0.000000000000000E+00 -.843216803071169E-03 0.000000000000000E+00</div>
<div> chi_1_2= 0.000000000000000E+00 -.949574977107089E+03 0.000000000000000E+00</div>
<div> chi_2_2= 0.000000000000000E+00 0.189915026381885E+04 0.000000000000000E+00</div>
<div> chi_3_2= 0.000000000000000E+00 0.110034487599961E-03 0.000000000000000E+00</div>
<div> chi_1_3= 0.000000000000000E+00 -.838178086194996E-03 0.000000000000000E+00</div>
<div> chi_2_3= 0.000000000000000E+00 0.109036445082823E-03 0.000000000000000E+00</div>
<div> chi_3_3= 0.000000000000000E+00 0.153710402502629E+03 0.000000000000000E+00</div>
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<p>What is meaning of each row and how can I get the absorption coefficients?</p>
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<p>Many thanks.</p>
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<p>Clarence</p>
<p>City University of Hong Kong</p>
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