# MULTIPOLE

This section is used to set up the decoupling of QM periodic images with the use of density derived atomic point charges. [Edit on GitHub]

Subsections

- CHECK_SPLINE
- INTERPOLATOR
- PROGRAM_RUN_INFO

## Keywords

- ANALYTICAL_GTERM

- EWALD_PRECISION

- NGRIDS

- RCUT

## Keyword descriptions

ANALYTICAL_GTERM: logical = F

  Lone keyword: `T`

  Usage: ANALYTICAL_GTERM <LOGICAL>

  Evaluates the Gterm in the Ewald Scheme analytically instead of using Splines. [Edit on GitHub]

EWALD_PRECISION: real = 1.00000000E-006 [hartree]

  Usage: EWALD_PRECISION {real}

  Precision achieved in the Ewald sum. [Edit on GitHub]

NGRIDS: integer[3] = 50 50 50

  Usage: NGRIDS <integer> <integer> <integer>

  Specifies the number of grid points used for the Interpolation of the G-space term [Edit on GitHub]

RCUT: real = [angstrom]

  Usage: RCUT {real}

  Real space cutoff for the Ewald sum. [Edit on GitHub]