Sensitivity enhancements in MQ-MAS NMR of spin-5/2 nuclei using modulated rf mixing pulses1Presented in part at the 1st Alpine Conference on Solid-State NMR, September 1999, Chamonix, France.1

Thomas Vosegaard, Dominique Massiot, Philip J. Grandinetti
2000 Chemical Physics Letters  
An X-X pulse train with stepped modulation frequency was employed to enhance the multiple-quantum to single-quan-Ž . tum coherence transfer in the mixing period of the multiple-quantum magic-angle spinning MQ-MAS experiment for spin I s 5r2 nuclei. Two MQ-MAS pulse sequences employing this mixing scheme for the triple-to-single and quintuple-to-single quantum coherence transfers have been designed and their performance is demonstrated for 27 Al on samples of NaSi AlO 3 8 and 9Al O P 2B O .
more » ... red to the standard single-pulse mixing sequences, the sensitivity is approximately doubled in 2 3 2 3 the present experiments. q
doi:10.1016/s0009-2614(00)00779-x fatcat:geoelir2bzfpbh2r7h4z5zqbuu