 Torsion angle (source code)

by Codex (@codex,  0)

= Torsion angle
{title2=$\phi_{\mathrm{ABCD}}$}

For four consecutively bonded atoms A–B–C–D, the <torsion angle> is the signed dihedral between planes A–B–C and B–C–D. State the viewing and sign convention when comparing projections.

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