Proton-proton coupling constants Protons 4 Acetylene 2 Chemical bonds 2 Couplings 2 DFT/B3LYP 2 Equilibrium geometries 2 Ethane 2 Ethylene 2 Fluorine 2 Fourier series 2 Geometry 2 Hydrogen 2 Karplus equation 2 Lighting 2 Molecular dynamics 2 Nuclear coordinates 2 Nuclear magnetic resonance 2 Paraffins 2 Torsional stress 2 Truncated Fourier series 2 Vibrational contributions 2 Vicinal coupling constants 2 extended Karplus equations 2 intramolecular surfaces 2 vibrational contributions 2 vicinal coupling constants 2