optical spectrum

[myrta gruning]

Dear Samaneh

for the Bethe Salpeter it is important to correct accurately the states close to the gap/involved in the excitations.
yambo will use an extrapolation to get the correction for the other states (both core and higher conduction states).

In any case I would advise to check the convergence with parameters.

Best,
m

[Daniele Varsano]

Dear Samaneh,
in general the number of bands entering to build up the excitonic matrix is different form the one you need to converge the polarizzability (screening).
In general you can avoid to include all the valence bands. I suggest you to do convergences studies including few valence and conduction bands and then increasing the windows until you get converged results (usually one is interest at the lower part of the spectrum).

Best,
Daniele

PS: fill the signature in your profile w9th your affiliation, avoiding then to include it in every post.

[samaneh]

Dear Dr Daniele and Dr Myrta,
Thank you for your quick replies
Best regards
S. Ataei