Method for editing CPMAS solid-state NMR spectra

摘要

A method for spectral editing in a solid-state, cross-polarization magic angle spinning NMR experiment involving a first nuclear species and a second nuclear species wherein the sample is rotated at a fixed rotation frequency and the first nuclear species is excited with at least one radio-frequency preparation pulse; the first nuclear species and the second nuclear species are subsequently irradiated with cross-polarization radiation and the first nuclear species is irradiated with decoupling radiation while transverse magnetization is being detected from the second nuclear species, CHARACTERIZED IN THAT the cross-polarization radiation comprises at least one radio-frequency pulse sequence having a predetermined time duration and composed of twenty-four 90° radio-frequency pulses having the relative phases:   -Y, X, -Y, -Y, X, -Y, Y, X, Y, Y, X, Y, -Y, -X, -Y, -Y, -X, -Y, Y, -X, Y, Y, -X, Y   where the phase of an X pulse differs from the phase of a Y pulse by 90°, the phase of an X pulse differs from the phase of a -X pulse by 180° and the phase of a Y pulse differs from the phase of a -Y pulse by 180°; and the sample rotation frequency is adjusted so that the rotation period is an integral multiple of the radio-frequency pulse sequence time duration.