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QM/MM Input: Electrostatic coupling<br />

Explicit electrostatic interaction<br />

(modified Coulomb interaction)<br />

NN_atoms<br />

a. Charge > 0.1e<br />

Explicit electrostatic<br />

interaction<br />

(NN_atoms)<br />

b. Charge < 0.1e<br />

ESP coupling<br />

Hamiltonian<br />

(EC atoms)<br />

(R)ESP<br />

coupling<br />

Hamiltonian<br />

(EC atoms)<br />

If LONG-RANGE<br />

Interaction with a<br />

multipole expansion<br />

for the QM<br />

system up to quadrupolar<br />

order<br />

(file MULTIPOLE)<br />

If not:<br />

Coupling in the EC<br />

area via force-field<br />

charges.<br />

RCUT_NN<br />

RCUT_MIX RCUT_ESP

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