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— Zhehong Gan:
Solid state NMR spectra of quadrupolar nuclei are broadened by the
second-order quadrupolar effect. High magnetic fields reduce the
second-order effect while increasing peak separation through chemical shift
resulting quadratic gain in spectral resolution. The 27Al spectra of
9Al2O3+2B2O3
(Fig. 1, sample courtesy of D. Massiot, CNRS at Orlean France)
illustrate the power of high magnetic fields for high resolution NMR of
quadrupolar nuclei. The spectrum that was obtained at NHMFL's 45 Tesla hybrid magnet
shows the sharpest 27Al peaks. The second-order quadrupolar linebroadening is almost gone.
Fig. 1
The 27Al spectra of 9Al2O3+2B2O3
obtained at different field strengths, including one from NHMFL's 40 Tesla hybrid magnet. |
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