Chinese Journal of Magnetic Resonance ›› 2022, Vol. 39 ›› Issue (1): 96-107.doi: 10.11938/cjmr20212910
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Kai-rui HU,Xue YANG,Zhi-ming HUANG,Jia-xiang XIN,Da-xiu WEI*(),Ye-feng YAO*()
Received:
2021-04-16
Online:
2022-03-05
Published:
2021-06-02
Contact:
Da-xiu WEI,Ye-feng YAO
E-mail:dxwei@phy.ecnu.edu.cn;yfyao@phy.ecnu.edu.cn
CLC Number:
Kai-rui HU,Xue YANG,Zhi-ming HUANG,Jia-xiang XIN,Da-xiu WEI,Ye-feng YAO. Preparing Nuclear Spin Singlet State in a Three-spin System and Its Application in 2D Spectrum[J]. Chinese Journal of Magnetic Resonance, 2022, 39(1): 96-107.
Fig.2
(a) Optimal control (OC/OC′) pulse sequence for preparing and converting nuclear spin singlet state. The combination of CW and gradient field can remove spin coherent-states and retain nuclear spin singlet state. (b) The amplitude of OCI pulse versus time while OCI works; (c) The phase of OCI pulse versus time while OCI works
Fig.3
(a) The evolution trajectory of the spin states in a two-spin system (assume no J-coupling between Hb and Ha, Ha') operated by the pulse OCI; (b) The evolution trajectory of the spin states in an actual three-spin system operated by the pulse OCI'; (c) The evolution trajectory of the spin states in a three-spin system operated by the pulse OCI
Fig.5
(a) Simulated singlet state spectra of NAA solution with pH of 2.3 obtained by (1) OC pulse sequence, (2) OC$ \mathrm{\text{'}} $ pulse sequence, and its (3) simulated and (4) experimental single pulse 1H NMR spectra; (b) Four simulated singlet state spectra using OC$ \mathrm{\text{'}} $ pulse sequence with offsetting the radio frequency center O1 of (1) 10 Hz, (2) 5 Hz, (3) ?5 Hz, (4) ?10 Hz, respectively; (c) Simulated (1) singlet state spectrum with OC′′ pulse and (2) single pulse 1H NMR spectrum of NAA solution with pH of 5.5
Fig.6
(a) The TS decay curve of the singlet state of Ha, Ha′ in NAA, TS=4.81±0.23 s; (b) The T1 decay curve of Ha、Ha′ in NAA, T1=0.73±0.03 s; (c) Experimental 1D NMR spectrum (the sample pH=2.3) of the nuclear spin singlet state. The gradient pulse and CW pulse have the effect of signal selection. The signals of Ha and Ha′ are reserved, while the other signals are suppressed
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