Dear All users
I should a force field for CaCO3 that includes these terms for bonded interaction:
Harmonic bond stretch term , harmonic cosine angle bending term , inversion term is of the
umbrella type , bond-angle and bond-bond cross-terms:
The last term is :
D(R1 - R1,0)(cos θ - cos θ0) + E(R2 - R2,0)(cos θ - cos θ0) + KR1R2(R1 - R1,0)(R2 - R2,0)
I can’t find this cross term in the manual, Is it possible to use this cross term in Lammps input?