electron spin resonance article 46 Electron Spin Resonance Spectroscopy 30 chemistry 28 Crystallography, X-Ray 22 Models, Molecular 20 X ray crystallography 20 magnetism 20 chemical structure 18 ligand 18 Copper 14 Ligands 14 copper 14 nonhuman 14 priority journal 14 complex formation 12 infrared spectroscopy 12 Magnetics 10 Oxidation-Reduction 10 Paramagnetic resonance 10 Raman spectrometry 10 kinetics 10 metabolism 10 molecular dynamics 10 nitric oxide 10 oxidation reduction reaction 10 pH 10 Electron spin resonance spectroscopy 8 Heme 8 Hydrogen Bonding 8