How to calculate polarizability


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Thank you for your reply. But, Symmetry C6 gave the same error message;

tddft_init: non-Abelian symmetry not permitted        0

Instead, I tried Symmetry C1. From this, the error message of non-Abelian symmetry
did not appeared. However, this job abnormally stopped without any error message. 
The last part of the output file is as follows. What is something wrong with the input file?

    1 smallest eigenvalue differences (eV) 


 No. Spin  Occ  Vir  Irrep   E(Occ)    E(Vir)   E(Diff)


   1    1   21   22 a        -0.246     0.004     6.801



 Entering Davidson iterations
Restricted singlet excited states

 Iter   NTrls   NConv    DeltaV     DeltaE      Time   
---- ------ ------ --------- --------- ---------
1 1 0 0.34E+00 0.10+100 11.9
2 3 0 0.22E+00 0.56E-01 16.8
3 5 0 0.84E-01 0.15E-01 16.9
4 7 0 0.86E-02 0.21E-02 16.8
5 9 0 0.21E-02 0.39E-04 16.9
6 11 0 0.14E-02 0.13E-05 16.9
7 13 0 0.24E-03 0.68E-06 17.1
8 15 1 0.57E-04 0.26E-07 16.9