Printing Core Charges for Bader analysis
    Satish Kumar 
    satis... at gmail.com
       
    Fri Jun 10 22:21:35 UTC 2016
    
    
  
Hello CP2K users
I was trying to obtain "proper?" Bader charges (Using Henkelman's program) 
for a CO2 molecule. Right now, I am getting the charge associated with C 
atom to be zero. In VASP, we can add the LAECHG=TRUE tag that will print 
the core charges too (http://theory.cm.utexas.edu/henkelman/code/bader/). 
Doing so in VASP gives a reasonable (around 2 electrons) charge associated 
with C atom. After looking up the CP2K Google group I tried a couple of 
other options in an attempt to get the total (valence + core) charge 
density. I tried the following print sections:
1)
&PRINT
    &E_DENSITY_CUBE
      STRIDE 1
    &END E_DENSITY_CUBE
&END PRINT
2)
  &PRINT
   &E_DENSITY_CUBE
      STRIDE 1
      TOTAL_DENSITY .TRUE.
    &END E_DENSITY_CUBE
  &END PRINT
3) This one gave wrong results I think (number of electrons estimated from 
Bader was 0). 
  &PRINT
    &TOT_DENSITY_CUBE
      STRIDE 1
    &END TOT_DENSITY_CUBE
  &END PRINT
Input file:
&FORCE_EVAL
  METHOD Quickstep
  &DFT
    UKS
    BASIS_SET_FILE_NAME /home/siyemperumal/GTH_BASIS_SETS_5-12-10
    POTENTIAL_FILE_NAME /home/siyemperumal/GTH_POTENTIALS_5-12-10
    WFN_RESTART_FILE_NAME co2-RESTART.wfn
    &MGRID
      CUTOFF 1600
    &END MGRID
    &QS
      WF_INTERPOLATION ASPC
      EXTRAPOLATION_ORDER 3
    &END QS
    &SCF
     EPS_SCF 1.E-6
     SCF_GUESS RESTART
     MAX_SCF 500
     &OT T
       PRECONDITIONER FULL_SINGLE_INVERSE
       MINIMIZER DIIS
       LINESEARCH 3PNT
     &END OT
    &END SCF
    &XC
      &XC_FUNCTIONAL PBE
      &END XC_FUNCTIONAL
      &VDW_POTENTIAL
         DISPERSION_FUNCTIONAL PAIR_POTENTIAL
         &PAIR_POTENTIAL
            TYPE DFTD3(BJ)
            PARAMETER_FILE_NAME 
/home/siyemperumal/Research/cp2k/package/cp2k/data/dftd3.dat 
            REFERENCE_FUNCTIONAL PBE
    &PRINT_DFTD MEDIUM
    &END PRINT_DFTD
         &END PAIR_POTENTIAL
      &END VDW_POTENTIAL
    &END XC
  &PRINT
#Tried the above three combinations
  &END PRINT
  &END DFT
  &SUBSYS
    &CELL
      ABC 12.00 13.00 14.00 
    &END CELL
    &TOPOLOGY
    &END TOPOLOGY
    &COORD
C         0.0000153980        0.0000010425        0.0006891492
O         1.1762907217        0.0000004039        0.0006107401
O        -1.1763057650       -0.0000013603        0.0006092107
    &END COORD
    &KIND O
      BASIS_SET DZVP-MOLOPT-GTH 
      POTENTIAL GTH-PBE-q6
    &END KIND
    &KIND C
      BASIS_SET DZVP-MOLOPT-GTH 
      POTENTIAL GTH-PBE-q4
    &END KIND
  &END SUBSYS
&END FORCE_EVAL
&GLOBAL
  PROJECT co2
  RUN_TYPE ENERGY 
  #RUN_TYPE GEO_OPT 
  PRINT_LEVEL LOW
&END GLOBAL
 &MOTION
  &GEO_OPT
    MAX_ITER 200 
    MAX_FORCE 0.0009725  #0.05 eV/A
    OPTIMIZER BFGS 
  &END GEO_OPT
 &END MOTION
Related Output that is printed:
  Electronic density on regular grids:        -15.9999999999        
0.0000000001
  Core density on regular grids:               15.9999999994       
-0.0000000006
  Total charge density on r-space grids:       -0.0000000005
  Total charge density g-space grids:          -0.0000000005
Thank you for any ideas. 
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