期刊
JOURNAL OF CHEMICAL PHYSICS
卷 142, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4907275
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资金
- Swiss National Science Foundation [200020_134681]
- ETH Zurich [ETH-04 09-3]
- PEP grant from the Indo-Swiss Joint Research Program (ISJRP)
- Swiss National Science Foundation (SNF) [200020_134681] Funding Source: Swiss National Science Foundation (SNF)
We show a theoretical framework, based on triple-mode Floquet theory, to analyze recoupling sequences derived from symmetry-based pulse sequences, which have a non-vanishing effective field and are not rotor synchronized. We analyze the properties of one such sequence, a homonuclear double-quantum recoupling sequence derived from the C7(2)(1) sequence. The new asynchronous sequence outperforms the rotor-synchronized version for spin pairs with small dipolar couplings in the presence of large chemical-shift anisotropy. The resonance condition of the new sequence is analyzed using triple-mode Floquet theory. Analytical calculations of second-order effective Hamiltonian are performed to compare the efficiency in suppressing second-order cross terms. Experiments and numerical simulations are shown to corroborate the results of the theoretical analysis. (C) 2015 AIP Publishing LLC.
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