Broadening value of optical spectra

[ams_nanolab]

What should be the ideal value of the Broadening parameter in optical spectra calculator? How this would vary for say 2D and bulk materials?

[zh]

It is hard to determine the ideal value of broadening parameter for all cases.  If you know the experiment spectra, you may tune the value of the broadening parameter in the simulated optical spectrum to make it match the experiment ones as much as as possible.
Please take a look at the following webpage for the background of broadening in different spectra lines:
https://en.wikipedia.org/wiki/Spectral_line_shape

[ams_nanolab]

Okay, in this regard, what does a large or small broadening value have to signify? Does it sharpen / broaden the absorption peaks any way? Or does it more affect the position (energy) of the optical spectra/ absorption peaks?

[Anders Blom]

Broadening, quite logically, affects the broadening, yes, and not the positions.