High-resolution nuclear magnetic resonance spectroscopy for measuring hydrogen-hydrogen J coupling constant
A technology of nuclear magnetic resonance spectroscopy and coupling constants, which is applied in the direction of nuclear magnetic resonance analysis, etc., can solve the problems of difficult J coupling constant measurement, small chemical shift distribution range, complex splitting mode, etc.
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[0020] Below in conjunction with accompanying drawing and implementation example, the present invention will be further described:
[0021] A high-resolution nuclear magnetic resonance spectroscopy method for measuring hydrogen-hydrogen J coupling constants, comprising the following steps:
[0022] 1) collecting the NMR one-dimensional spectrum of the sample;
[0023] 2) Measure the pulse width of the 90-degree hard pulse of the sample;
[0024] 3) Select the hydrogen nucleus to be detected and another hydrogen nucleus with J coupling thereto, and set the action frequency of the two-color pulse according to their resonance frequencies;
[0025] 4) Determine the pulse width of the single-color and two-color selective 180-degree pulses according to the position and distribution range of the hydrogen nuclei to be acted on in the one-dimensional spectrum, and measure the power of the single-color and two-color selective 180-degree pulses;
[0026] 5) Set the value of Δ, which is...
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