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I am aware that one can compute absorption coefficient ($\alpha$) from the dielectric function with the equation $\alpha$ = $(4*pi*k$)/$\lambda$ … (1)

Or from the equation $\alpha$ = k*$\omega$ … (2)

How do I obtain the k and $\lambda$ values so that I can calculate $\alpha$? I am using the Quantum espresso code

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  • $\begingroup$ Welcome to MMSE. Please consider writing equations and mathematical symbols in the MathJax implementation of $LaTeX$ markup. I think it also helps to mention the code you are using for your DFT calculations. $\endgroup$
    – Sha
    Commented Jul 21, 2023 at 18:25
  • $\begingroup$ Musa please make a note of the changes I have made and use similarly in your future que. This is what @Sha was mentioning in his above comment. $\endgroup$ Commented Jul 22, 2023 at 4:53

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