Double-quantum NMR spectroscopy of P species submitted to very large CSAs |
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Authors: | B Hu L Delevoye O Lafon J Trbosc JP Amoureux |
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Institution: | aUCCS, CNRS-8181, Lille-University, Villeneuve D’Ascq, France |
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Abstract: | We introduce an original pulse sequence, , which is a block super-cycled sequence employing as basic element a π pulse sandwiched by ‘window’ intervals. This homonuclear dipolar recoupling method allows the efficient excitation of double-quantum coherences between spin-1/2 nuclei submitted to very large chemical shift anisotropy. We demonstrate that this technique can be employed in double-quantum ↔ single-quantum 31P homonuclear correlation experiment at high magnetic field (B0 14 T) and high MAS frequencies (νR 30 kHz). The performances of are compared to those of the double-quantum recoupling methods, such as BABA and bracketed fp-RFDR, which were already employed at fast MAS rates. The sequence displays a higher robustness to CSA and offset than the other existing techniques. |
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Keywords: | Solid-state NMR Double-quanta Large CSA Phosphorous atoms |
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