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Point_ChargePoint_ChargePurposeThe Point_Charge keyword specifies that the calculation is to include point-charges.
SyntaxPoint_Charge value
[table][tr][td]command keyword [/td][td]values [/td][td]default [/td][td]meaning [/td][/tr][tr][td]Point_Charge [/td][td]on/off [/td][td]off [/td][td]Add point charges to the calculation if value is "on". The locations of point charges are read from the runname.pchg file. [/td][/tr][/table]DescriptionPoint charges can be used to simulate the chemical environment due to a large molecule or crystal. The validity of such a calculation depends, of course, on the validity of the point-charge model and the choice of charges used. Point charges can be used in combination with point group symmetry. You need to make sure, however, that the symmetry used in the calculation is a subgroup of the symmetry of both the central molecule and the point charge system.
The point charge file can be in the form of a .car file or in a generic .pchg format. The .pchg format is:
@PCHARGESX Y Z CHARGEX Y Z CHARGE.....$endWhere X, Y and Z are cartesian coordinates of the point charge, CHARGE is its charge and all fields are in floating-point format.

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# Task parameters
Calculate                     energy
Symmetry                      on
Max_memory                    2048

# Electronic parameters
Spin_polarization             restricted
Charge                        0
Basis                         dnp
Pseudopotential               none
Functional                    pbe
Aux_density                   hexadecapole
Integration_grid              medium
Occupation                    fermi
Cutoff_Global                 5.5000 angstrom
Scf_density_convergence       5.0000e-002
Scf_charge_mixing             0.2000
Scf_iterations                500
Scf_diis                      off
Point_Charge               on

# Print options
Print                         eigval_last_it

# Calculated properties
Mulliken_analysis             off
Hirshfeld_analysis            off
Esp_fit                       on


µãµçºÉµÄÐÅϢдÔÚÒ»¸öpointcharge.pchgÎļþÖУº
@PCHARGES
   2.605   4.980   0.255     1.265   
   5.175   4.898   1.964     1.485   
   5.133   5.586   3.447    -0.730   
   6.571   4.276   1.865    -0.657   
   4.880   5.990   0.918    -0.688   
......
$end
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Point_Charge               on
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Point_Charge               pointcharge.pchg
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