An analysis of phase-modulated heteronuclear dipolar decoupling sequences in solid-state nuclear magnetic resonance |
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Authors: | Thakur Rajendra Singh Kurur Narayanan D Madhu P K |
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Affiliation: | Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India. |
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Abstract: | The design of variants of the swept-frequency two-pulse phase modulation sequence for heteronuclear dipolar decoupling in solid-state NMR is reported, their performance evaluated, and compared with other established sequences like TPPM and SPINAL. Simulations performed to probe the role of the homonuclear (1)H-(1)H bath show that the robustness of the decoupling schemes improves with the size of the bath. In addition, these simulations reveal that the homonuclear (1)H-(1)H bath also leads to broad baselines at high MAS rates. Results from a study of the SPINAL decoupling scheme indicate that optimisation of the starting phase and phase increment improves its performance and efficiency at high MAS rates. Additionally, experiments performed on a liquid crystal display the role of the initial phase in SPINAL-64 and sequences in the SW(f)-TPPM family. |
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Keywords: | Solid-State NMR Heteronuclear dipolar decoupling TPPM SPINAL Swept-frequency TPPM Liquid crystal |
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