Enhanced triple-quantum excitation in 13C magic-angle spinning NMR.
نویسندگان
چکیده
We describe a new method for exciting triple-quantum coherences in 13C-labelled powder samples under MAS. The proposed method combines selective double-quantum excitation with rotational resonance and frequency-selective composite pulses. The spin dynamics of this new method are described theoretically. Numerical calculations of the spin dynamics are compared to experimental results on fully 13C-labelled L-alanine. The observed triple-quantum filtering efficiency is around 10% for the most intense spectral peak. The method is also demonstrated on other fully 13C-labelled compounds, including a uniformly 13C-labelled amino acid.
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ورودعنوان ژورنال:
- Journal of magnetic resonance
دوره 162 2 شماره
صفحات -
تاریخ انتشار 2003