Copper ESEEM and HYSCORE through ultra-wideband chirp EPR spectroscopy

作者：Takuya F. Segawa, Andrin Doll, Stephan Pribitzer, Gunnar Jeschke · 发表于：The Journal of Chemical Physics · 年份：2015 · DOI：10.1063/1.4927088 · 被引用次数：37 · 研究领域：Electron Spin Resonance Studies、Lanthanide and Transition Metal Complexes、Magnetism in coordination complexes

The main limitation of pulse electron paramagnetic resonance (EPR) spectroscopy is its narrow excitation bandwidth. Ultra-wideband (UWB) excitation with frequency-swept chirp pulses over several hundreds of megahertz overcomes this drawback. This allows to excite electron spin echo envelope modulation (ESEEM) from paramagnetic copper centers in crystals, whereas up to now, only ESEEM of ligand nuclei like protons or nitrogens at lower frequencies could be detected. ESEEM spectra are recorded as two-dimensional correlation experiments, since the full digitization of the electron spin echo provides an additional Fourier transform EPR dimension. Thus, UWB hyperfine-sublevel correlation experiments generate a novel three-dimensional EPR-correlated nuclear modulation spectrum.