title: Proton decoupling and recoupling under double-nutation irradiation in solid-state NMR.
abstract: The effect of (1)H decoupling in magic-angle spinning solid-state NMR is studied under radiofrequency irradiation causing simultaneous nutations around a pair of orthogonal axes. Double-nutation with an arbitrary pair of nutation frequencies is implemented through modulation of the amplitude, phase, and frequency of the transmitting pulses. Similarity and difference of double-nutation decoupling and two-pulse phase-modulation decoupling schemes [A. E. Bennett, C. M. Rienstra, M. Auger, K. V. Lakshmi, and R. G. Griffin, J. Chem. Phys. 103, 6951-6958 (1995) and I. Scholz, P. Hodgkinson, B. H. Meier, and M. Ernst, J. Chem. Phys. 130, 114510 (2009)] are discussed. The structure of recoupling bands caused by interference of the (1)H spin nutation with sample spinning is studied by both experiments and numerical simulations.
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502 Kyoto, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Takeda
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502 Kyoto, Japan.
authors.forename: Asato
authors.initials: A
authors.lastname: Wakisaka
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502 Kyoto, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takegoshi