Efficient heteronuclear decoupling by quenching rotary resonance in solid-state NMR

A method for heteronuclear decoupling in magic-angle spinning nuclear magnetic resonance measurements of solid samples, the method comprising the steps of:

• a) applying a decoupling RF-pulse sequence with a nutation frequency ν1I on spins (I) of a first kind of nucleus;
• and
• b) applying an excitation pulse on spins (S) of a second kind of nucleus, which is different from the first kind of nucleus, wherein the decoupling RF-pulse sequence comprises m blocks of pulses, with m≧4, each block comprising an N-fold repetition of a pair of pulses (τp)x(τp)−x, (τp)y(τp)−y, (τp)−x(τp)x or (τp)−y(τp)y, wherein τp, given in parentheses, is a pulse duration (τp) and x, −x, y, −y, given in subscripts, are pulse phases, wherein N>1 and N is an integer number, τp being equal for all pulses, wherein the pulse phases of all pulses in the pulse pair of the (i+1)-th block are inverted with respect to the pulse pair of the i-th block, with i=1 . . . m−1 and i is an odd number, the pulses (τp)x, (τp)−x, (τp)y, (τp)−y within each pair (τp)x(τp)−x, (τp)y(τp)−y being phase inverted, and a phase shift of the pulses (τp)x, (τp)−x, (τp)y, (τp)−y is carried out after each j-th block, with j≦m, wherein j is an even number.