1996/05/01 by T. Nishida, Toshikazu Nishida, Göran Widmalm +3
Biochemistry, Genetics and Molecular Biology · Chemistry · Physics and Astronomy · #Electron Spin Resonance Studies #Molecular spectroscopy and chirality #Spectroscopy and Quantum Chemical Studies
paper · doi:10.1002/(sici)1097-458x(199605)34:5<377::aid-omr893>3.0.co;2-u
openalex publication_date 1996/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/07
Sources of artifacts in Hadamard spectra were investigated and identified as insufficient suppression of signals from solvent, protons attached to 12C atoms and error signals caused by non-ideal excitation and the subsequent Hadamard transformation. Pulsed field gradients (PFG) effectively eliminate the former error signals while re-optimized Hadamard-shaped pulses produce practically ideal excitation and Hadamard transformation affords artifact-free spectra. Long-range 13C–1H coupling constants of 1,6-anhydro-β-D-galactopyranoside and 3-acetylpyridine were determined by using a PFG pulse sequence and re-optimized Hadamard-8 shaped pulses.