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## Main Question or Discussion Point

Hello

1- I calculate optical properties of a pure compound in framework of DFT with pseudopotential by software. I get several picks in loss function. Does only the highest , determine plasma frequency or all of them with different density of valence electrons?

2-can we conclude the picks of the ε1 always show the maximum of transmisson?

Thanks

1- I calculate optical properties of a pure compound in framework of DFT with pseudopotential by software. I get several picks in loss function. Does only the highest , determine plasma frequency or all of them with different density of valence electrons?

2-can we conclude the picks of the ε1 always show the maximum of transmisson?

Thanks