Hello SIESters,

I am doing optical calculation for an organic crystal with 136 atoms using
van der Waals (KBM functional, using trunk 433 and 449/450). I previously
optimize the atom positions and later optimize the cell parameters too. The
calculations of PDOS and charges (Bader and Voronoi) run without any
problem/message.

Any help is welcome!

The parameters for the optical calculation in my input are:

OpticalCalculation     .true.
Optical.EnergyMinimum 0 eV
Optical.EnergyMaximum 10 eV
Optical.Broaden 0.05 eV
Optical.PolarizationType polycrystal
%block Optical.Mesh
4 4 4
%endblock Optical.Mesh

The last lines in the log file are:

                            Begin CG move =      0
                        ==============================

outcell: Unit cell vectors (Ang):
        9.617793    0.000000    0.000000
       -0.000053    7.555616    0.000000
       -3.800820    0.000141   15.540658

outcell: Cell vector modules (Ang)   :    9.617793    7.555616   15.998696
outcell: Cell angles (23,13,12) (deg):     89.9994    103.7432     90.0004
outcell: Cell volume (Ang**3)        :   1129.3140
 Folding of H and S is implicitly performed
New_DM. Step:     1
Initializing Density Matrix...

initdm: Initial spin polarization (Qup-Qdown) =  216.000000
New grid distribution:   1
           1       1:   50    1:   40    1:   81

InitMesh: MESH =   100 x    80 x   162 =     1296000
InitMesh: (bp) =    50 x    40 x    81 =      162000
InitMesh: Mesh cutoff (required, used) =   300.000   300.326 Ry
ExtMesh (bp) on 0 =   106 x    96 x   137 =     1394112
PhiOnMesh: Number of (b)points on node 0 =               162000
PhiOnMesh: nlist on node 0 =             10696711

[]'s,

@mps

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