PIC microcontroller based external fast analog to digital converter to acquire wide-lined solid NMR spectra by BRUKER DRX and Avance-I spectrometers

Solid State Nuclear Magnetic Resonance
Bálint Koczor, János Rohonczy

Abstract

Concerning many former liquid or hybrid liquid/solid NMR consoles, the built in Analog-to-Digital Converters (ADCs) are incapable of digitizing the fids at sampling rates in the MHz range. Regarding both strong anisotropic interactions in the solid state and wide chemical shift dispersion nuclei in solution phase such as (195)Pt, (119)Sn, (207)Pb etc., the spectrum range of interest might be in the MHz range. As determining the informative tensor components of anisotropic NMR interactions requires nonlinear fitting over the whole spectrum including the asymptotic baseline, it is prohibited by low sampling rates of the ADCs. Wide spectrum width is also useful in solution NMR, since windowing of wide chemical shift ranges is avoidable. We built an external analog to digital converter with 10 MHz maximal sampling rate, which can work simultaneously with the built in ADC of the spectrometer. The ADC was tested on both Bruker DRX and Avance-I NMR consoles. In addition to the analog channels it only requires three external digital lines of the NMR console. The ADC sends data to PC via USB. The whole process is controlled by software written in JAVA which is implemented under TopSpin.

References

Oct 27, 2011·Progress in Nuclear Magnetic Resonance Spectroscopy·Luke A O'Dell
Oct 2, 2012·Journal of Magnetic Resonance·Kristopher J HarrisRobert W Schurko
Jun 12, 2013·Accounts of Chemical Research·Robert W Schurko

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Citations

Jan 22, 2019·Evidence-based Complementary and Alternative Medicine : ECAM·Jue ZhouPaul J Hardiman

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