Clean in-phase layer selection in-core selective coherence spectrum method
A technology of nuclear selectivity and selectivity, which is applied in the field of nuclear magnetic resonance of layer-selective homonuclear selective coherent spectrum, can solve the problems of consuming experiment time and difficulty in spectrum analysis, achieve clear spectrum, reduce experiment time, and avoid signal self-cancelling effect
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[0022] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
[0023] The invention provides a clean and homogeneous layer-selected homonuclear selective coherence spectrum method, which is characterized in that it comprises the following steps:
[0024] 1) collecting the NMR one-dimensional spectrum of the sample;
[0025] 2) Measure the pulse width of the 180-degree hard pulse of the sample;
[0026] 3) Measure the pulse width and time of the sample's excitation nuclear 90-degree selective pulse, observation nuclear 90-degree selective pulse, and inversion 90-degree selective pulse;
[0027] 4) Set dephasing gradient G 1 , G 2 and G 3 the intensity and duration of
[0028] 5) Set the central position of the excited hydrogen nucleus to be studied as the center frequency of the selective 90-degree selective pulse of the excited nucleus, and set the central position of the observed hydrogen nucleus to be studied as ...
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