| 06 Jul 2026
Line-Narrowing by Polychromatic Selective Spin-Locking in NMR
Abstract. Selective Spin-Locking (SSL) of the magnetisation vectors of selected singlets or multiplets in high-resolution Nuclear Magnetic Resonance (NMR) spectra by mono- or polychromatic selective radio-frequency (RF) irradiation can reduce the line-widths to the limit given by homogeneous T1ρ relaxation. The resulting line-narrowing leads to an increase in signal height of spectra of 1H, 19F, 31P or other nuclei that is in principle only limited by the ratio T1ρ/T2*. At the same time, the scalar interactions that give rise to multiplets are decoupled, thus leading to an additional gain in signal height. Common one-dimensional (1D) experiments such as inversion recovery (IR) as well as the excitation and reconversion of Long-Lived States (LLS) by Spin-Lock Induced Crossing (SLIC) can significantly benefit from SSL.
Competing interests: At least one of the (co-)authors is a member of the editorial board of Magnetic Resonance.
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