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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Performance of the cross-polarization experiment in conditions of radiofrequency field inhomogeneity and slow to ultrafast magic angle spinning (MAS).
Mag. Resonance 4, 199-215 (2023)
Verlagsversion
DOI
PMC
In this paper, we provide an analytical description of the performance of the cross-polarization (CP) experiment, including linear ramps and adiabatic tangential sweeps, using effective Hamiltonians and simple rotations in 3D space. It is shown that radiofrequency field inhomogeneity induces a reduction in the transfer efficiency at increasing magic angle spinning (MAS) frequencies for both the ramp and the adiabatic CP experiments. The effect depends on the ratio of the dipolar coupling constant and the sample rotation frequency. In particular, our simulations show that for small dipolar couplings (1ĝ€¯kHz) and ultrafast MAS (above 100ĝ€¯kHz) the transfer efficiency is below 40ĝ€¯% when extended contact times up to 20ĝ€¯ms are used and relaxation losses are ignored. New recoupling and magnetization transfer techniques that are designed explicitly to account for inhomogeneous radiofrequency fields are needed.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
ISSN (print) / ISBN
2699-0059
e-ISSN
2699-0016
Zeitschrift
Magnetic Resonance
Quellenangaben
Band: 4,
Heft: 2,
Seiten: 199-215
Verlag
Copernicus
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Structural Biology (STB)