Heteronuclear decoupling interference during symmetry-based homonuclear recoupling in solid-state NMR,

I. Marin-Montesinos, D. H. Brouwer, G. Antonioli, W. C. Lai, A. Brinkmann, and M. H. Levitt,
J. Magn. Reson. 177, 330-340, (2005).
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We examine the influence of continuous-​wave heteronuclear decoupling on symmetry-​based double-​quantum homonuclear dipolar recoupling, using experimental measurements, numerical simulations, and average Hamiltonian theory. There are two distinct regimes in which the heteronuclear interference effects are minimized. The first regime utilizes a moderate homonuclear recoupling field and a strong heteronuclear decoupling field; the second regime utilizes a strong homonuclear recoupling field and a weak or absent heteronuclear decoupling field. The second regime is experimentally accessible at moderate or high magic-​angle-​spinning frequencies and is particularly relevant for many realistic applications of solid-​state NMR recoupling experiments to organic or biological materials.