# PERIODIC

References: Laino2006

Specify parameters for QM/MM periodic boundary conditions calculations [Edit on GitHub]

Subsections

- CHECK_SPLINE
- INTERPOLATOR
- MULTIPOLE
- POISSON

## Keywords

- GMAX

- NGRIDS

- REPLICA

## Keyword descriptions

GMAX: real = 1.00000000E+000

  Usage: GMAX <real>

  Specifies the maximum value of G in the reciprocal space over which perform 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]

REPLICA: integer = -1

  Usage: REPLICA <integer>

  Specifies the number of replica to take into consideration for the real part of the calculation. Default is letting the qmmm module decide how many replica you really need. [Edit on GitHub]