lammps/lib/qmmm/example-ec/mm-master/water.in

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units real
neigh_modify delay 0 every 1 check yes
atom_style full
bond_style harmonic
angle_style harmonic
pair_style lj/cut/coul/long 10.0
pair_modify mix arithmetic
kspace_style pppm 1e-4
special_bonds amber
atom_modify sort 0 0
read_data data.water
timestep 1.
dump 1 all custom 1 dump.lammpstrj id element xu yu zu
dump 2 all custom 1 dump.force id element fx fy fz
dump 3 all xyz 1 dump.xyz
dump_modify 1 element O H
dump_modify 2 element O H
thermo_style multi
thermo 1
group wat id 25:27
fix 1 wat qmmm
fix 2 all nvt temp 300.0 300.0 70.0
fix 3 all shake 0.0001 20 0 b 1 a 1