Interaction frames in solid-state NMR: A case study for chemical-shift-selective irradiation schemes
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Date
2022-12
Publication Type
Journal Article
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yes
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Abstract
Interaction frames play an important role in describing and understanding experimental schemes in magnetic resonance. They are often used to eliminate dominating parts of the spin Hamiltonian, e.g., the Zeeman Hamiltonian in the usual (Zeeman) rotating frame, or the radio-frequency-field (rf) Hamiltonian to describe the efficiency of decoupling or recoupling sequences. Going into an interaction frame can also make parts of a time-dependent Hamiltonian time independent like the rf-field Hamiltonian in the usual (Zeeman) rotating frame. Eliminating the dominant term often allows a better understanding of the details of the spin dynamics. Going into an interaction frame can also reduces the energy-level splitting in the Hamiltonian leading to a faster convergence of perturbation expansions, average Hamiltonian, or Floquet theory. Often, there is no obvious choice of the interaction frame to use but some can be more convenient than others. Using the example of frequency-selective dipolar recoupling, we discuss the differences, advantages, and disadvantages of different choices of interaction frames. They always include the complete radio-frequency Hamiltonian but can also contain the chemical shifts of the spins and may or may not contain the effective fields over one cycle of the pulse sequence.
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published
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Journal / series
Solid state nuclear magnetic resonance
Volume
122
Pages / Article No.
101834
Publisher
Academic Press
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Methods
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Subject
Interaction frames; Floquet theory; Chemical-shift-selective recoupling; Solid-state NMR; Magic-angle spinning
Organisational unit
08829 - Ernst, Matthias (Tit.-Prof.)
Notes
Funding
188988 - Method Development in Solid-State NMR and Dissolution DNP (SNF)