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Tailored Low-power Cross-polarization Under Fast Magic-angle Spinning by Jean-Philippe Demers; Vinesh Vijayan; Stefan Becker; Adam Lange is a Chemistry article available to read on EtoBox.

What is Tailored Low-power Cross-polarization Under Fast Magic-angle Spinning about?

High static magnetic fields and very fast magic-angle spinning (MAS) promise to improve resolution and sensitivity of solid-state NMR experiments. The fast MAS regime has permitted the development of lowpower cross-polarization schemes, such as second-order cross-polarization (SOCP), which prevent heat deposition in the sample. Those schemes are however limited in bandwidth, as weak radio-frequency (RF) fields only cover a small chemical shift range for rare nuclei (e.g. 13 C). Another consideration is that the efficiency of cross-polarization is very sensitive to magnetization decay that occurs during the spinlock pulse on the abundant nuclei (e.g. 1 H). Having characterized this decay in glutamine at 60 kHz MAS, we propose two complementary strategies to tailor cross-polarization to desired spectral regions at low RF power. In the case of multiple sites with small chemical shift dispersion, a larger bandwidth for SOCP is obtained by slightly increasing the RF power while avoiding recoupling conditions that lead to fast spin-lock decay. In the case of two spectral regions with large chemical shift offset, an extension of the existing low-power schemes, called MOD-CP, is introduced

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Author

Jean-Philippe Demers; Vinesh Vijayan; Stefan Becker; Adam Lange

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 1090-7807)

Published

2010

Language

EN

Field

Chemistry (Physical Sciences)