A method for suppressing false peaks of nuclear magnetic resonance spectrum sampling truncation
A technology of nuclear magnetic resonance spectrum and sampling data, which is applied in the direction of analysis by nuclear magnetic resonance, material analysis through resonance, and measurement devices. The number of indirect dimension sampling points and the effect of reducing the number of indirect dimension sampling points
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Embodiment 1
[0052] Step 1. Set the first percentage threshold p and the second percentage threshold q, the value range of the first percentage threshold p is 95% to 98%, and the value range of the second percentage threshold q 0.005% to 0.015%.
[0053] Step 2, performing zero-filling and Fourier transform processing on the obtained time-domain signal a. The time domain signal a is a length N 1 complex array of The serial number of each element in the complex number array is M, and each element in the complex number array is the signal strength when the sampling time is M·Δt. The zero-filling process for the time-domain signal a is to sequentially add digital zeros at the end of the complex number array, and change the length of the complex number array by N 1 increase to N 2 .
[0054]
[0055] The Fourier transform is to fill the zero-filled time-domain signal a through the following formula The NMR spectrum A is obtained by transforming from the time domain to the frequency ...
Embodiment 2
[0087] Pure Shift experiment is a kind of direct dimension decoupling experiment. In the spectrum obtained by Pure Shift experiment, the coupling splitting is suppressed, and only the chemical shift (Chemical Shift) information is retained, which significantly reduces spectral peak overlap and simplifies spectral analysis. , so it is called the Pure Shift experiment.
[0088] The one-dimensional Pure Shift experiment is actually a pseudo-two-dimensional experiment, which is to extract the first few sampling points from a series of one-dimensional experimental sampling data, splicing them into a new time-domain signal, and then process the signal to obtain final spectrum.
[0089] Therefore, the one-dimensional Pure Shift experiment is more time-consuming than the conventional one-dimensional experiment, but if the number of indirect dimension sampling is reduced, the experimental time can be reduced, but the spliced time-domain signal faces the truncation effect introduced by ...
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