&FORCE_EVAL
 METHOD FIST
 &MM
  &FORCEFIELD
   &SPLINE
    EPS_SPLINE 1.0E-8
   &END
   &NONBONDED
    &TERSOFF
     ATOMS Si Si
     A        1.8308E3
     B        4.7118E2
     lambda1  2.4799
     lambda2  1.7322
     alpha    0.00
     beta     1.0999E-6
     n        7.8734E-1
     c        1.0039E5
     d        1.6218E1
     h       -5.9826E-1
     lambda3  1.7322
     bigR     2.85
     bigD     0.15
     RCUT    10.0
    &END TERSOFF
   &END NONBONDED
  &END FORCEFIELD
  &POISSON
   &EWALD
    EWALD_TYPE none
   &END EWALD
  &END POISSON
 &END MM
 &SUBSYS
  &CELL
   ABC  3.850  3.850  6.366
   ANGLES  90.0  90.0  120.0
   MULTIPLE_UNIT_CELL 3 3 3
   PERIODIC XYZ
  &END CELL
  &TOPOLOGY
   MULTIPLE_UNIT_CELL 3 3 3
   CONNECTIVITY OFF
  &END TOPOLOGY
  &COORD
   SCALED
   Si   1/3  2/3  0.063
   Si   1/3  2/3  0.437
   Si   2/3  1/3  0.563
   Si   2/3  1/3  0.937
  &END COORD
  &PRINT
   &ATOMIC_COORDINATES
   &END
   &CELL
   &END
  &END
 &END SUBSYS
 STRESS_TENSOR ANALYTICAL
 &PRINT
  &STRESS_TENSOR
  &END STRESS_TENSOR
 &END PRINT
&END FORCE_EVAL
&GLOBAL
 PREFERRED_DIAG_LIBRARY ScaLAPACK
 PRINT_LEVEL medium
 PROJECT Si_direct_cell_opt
 RUN_TYPE CELL_OPT
&END GLOBAL
&MOTION
 &CELL_OPT
  EXTERNAL_PRESSURE [bar] 1.0
  CONSTRAINT none
  KEEP_ANGLES no
  KEEP_SYMMETRY no
  MAX_DR    0.00001
  MAX_FORCE 0.000001
  MAX_ITER  400
  OPTIMIZER BFGS
  PRESSURE_TOLERANCE [bar] 10.0
  RMS_DR    0.000003
  RMS_FORCE 0.0000003
  TYPE direct_cell_opt
  &BFGS
   TRUST_RADIUS 0.1
   USE_MODEL_HESSIAN no
   USE_RAT_FUN_OPT on
  &END BFGS
 &END CELL_OPT
 &PRINT
  &CELL on
  &END CELL
  &RESTART on
   BACKUP_COPIES 0
  &END RESTART
  &RESTART_HISTORY off
  &END RESTART_HISTORY
 &END PRINT
&END MOTION
