Constant-adiabaticity radiofrequency pulses for generating long-lived singlet spin states in NMR

A method is implemented to perform “fast” adiabatic variation of the spin Hamiltonian by imposing the constant adiabaticity condition. The method is applied to improve the performance of singlet-state Nuclear Magnetic Resonance (NMR) experiments, specifically, for efficient generation and readout of...

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Veröffentlicht in:The Journal of chemical physics 2019-02, Vol.150 (6), p.064201-064201
Hauptverfasser: Rodin, Bogdan A., Sheberstov, Kirill F., Kiryutin, Alexey S., Hill-Cousins, Joseph T., Brown, Lynda J., Brown, Richard C. D., Jamain, Baptiste, Zimmermann, Herbert, Sagdeev, Renad Z., Yurkovskaya, Alexandra V., Ivanov, Konstantin L.
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Sprache:eng
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Zusammenfassung:A method is implemented to perform “fast” adiabatic variation of the spin Hamiltonian by imposing the constant adiabaticity condition. The method is applied to improve the performance of singlet-state Nuclear Magnetic Resonance (NMR) experiments, specifically, for efficient generation and readout of the singlet spin order in coupled spin pairs by applying adiabatically ramped RF-fields. Test experiments have been performed on a specially designed molecule having two strongly coupled 13C spins and on selectively isotopically labelled glycerol having two pairs of coupled protons. Optimized RF-ramps show improved performance in comparison, for example, to linear ramps. We expect that the methods described here are useful not only for singlet-state NMR experiments but also for other experiments in magnetic resonance, which utilize adiabatic variation of the spin Hamiltonian.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5079436