Hello all,

I would like to use Dreiding Force Field to calculate BH4 groups. I have found the bond and angle terms that I need from the manual. In addition to this, there are another two corss terms (bond-bond corss term and angle-angle cross term) that I want to use. Ebond-bond=K(R1-R0)*(R2-R0), Eangle-angle=K((cos θ1-cosθ)^2*(

**cosθ2-cos****θ**)^2. But I can’t find the two cross terms from bond_style and angle_style. Where I can find these two terms?

Thanks a lot in advance!

Best,

Hang