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. 2021 Oct 13;7(42):eabj5913. doi: 10.1126/sciadv.abj5913

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 3. — The sequence was optimized for an NCA transfer at 16.5-kHz MAS frequency and readjusted to keep synchronization with sample rotation. The insets show the first three rotor periods (τ_R) of the pulse sequence adapted in duration and rf amplitudes to MAS frequencies of 13 and 21 kHz. The tm-SPICE pulse sequence maintains more than 90% of its performance over a MAS frequency range of 13 to 21 kHz. When the sequence is used without rescaling (shown in gray), its efficiency is lost in a very narrow range.