Couplings 4 Ethane 4 Karplus equation Protons 4 Vicinal coupling constants 4 Acetylene 2 Cyclohexanes 2 DFT/B3LYP 2 Data acquisition 2 Equilibrium geometries 2 Ethylene 2 Fourier series 2 Geometry 2 Lighting 2 Mathematical models 2 Molecular geometries 2 Nuclear coordinates 2 Optimization 2 Probability density function 2 Proton-proton coupling constants 2 Torsional stress 2 Truncated Fourier series 2 Vibrational contributions 2 extended Karplus equations 2 intramolecular surfaces 2 vibrational contributions 2 vicinal coupling constants 2