Abstract
Sensitivity enhancement in solid-state nuclear magnetic resonance using a cryocoil magic-angle-spinning system was investigated, by comparing, at room temperature and at cryogenic temperature, the signal-to-noise ratios of the multiple-quantum magic-angle-spinning spectra as well as the conventional spectra for a low-γ nucleus 85Rb in RbNO3. The increase of the sample-coil quality-factor and the thermal noise reduction were found to enhance the sensitivities by approximately 4.5times; the former yielded the further doubled signal increase in the multiple-quantum spectroscopy via the increase of the radio-frequency field strengths. Eventually, 20–30times of the sensitivity enhancement were realized in the two-dimensional multiple-quantum magic-angle-spinning spectra.
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