Tetrahedral magic echo

Mastui et al.29S proposed a new version of the magic echo (ME) sequence, called tetrahedral magic echo (TME), which uses the so-called tetrahedral angle 0=109.5° instead of 90° in the ME or modified ME (MME). This is substantially superior to ME or MME line narrowing for solids where heteronuclear dipolar interaction between protons and the other nuclear species is comparable to the homonuclear proton-proton interaction. 

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