Dear all,
 as you suggested, i try to follow your tutorial for the Hubbard U coefficients 
determination, but i have some practical difficulties. 

Summarizing, i proceded as follow:

step 1)?> i have done a simple SCF with very low coefficients for Hubbard_U1 
and Hubbard_U2, enabling the wavefunction separate collection (wf_collect) ;
step 2)?> i have performed some SCF, restarting from the charge file stored 
previously,  introducing some fluctuation values in Hubbard_alpha (?), is it 
correct? 

the problem is at this point: do i need to rename every scf-file in which i 
performed a different perturbation? How can i, in the next step, ?recall? the 
different perturbation that i performed previously? 

At this point is obvious that i don?t know also how to calculate the response 
functions and so, obtaining the Hubbard U coefficient.

Can someone help me? 
Thanks a lot,
Tommaso,
Universit? C? Foscari of Venice

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