[Wien] direct or indirect absorption?

[Peter Blaha]

OPTIC includes of course only direct transition.

Am 07.09.2020 um 13:57 schrieb Fan:
> Dear Wien2k users,
> 
> Does the absorption generated by OPTIC include contributions from 
> indirect transitions? I personally think only direct transitions have 
> been taken into account. Because to compute the contribution of indirect 
> transition, one has to know about the dispersion of phonon. Is that right?
> 
> With regards,
> 
> Fan
> 
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