This technique was suggested by Andrew and Lowe, who showed that Hamiltonians describing nuclear-nuclear dipolar interactions are proportional to "three cosine squared theta minus one.
This technique requires recoupling times in CODEX experiments that are achieved via synchronized pi pulses, as CODEX measures dynamics on the seconds-scale by detecting CSAs that are lost in this technique. Techniques like REDOR and RFDR can be used to recover signals lost due to this technique to construct distance metrics between labeled nuclei. This technique is only useful when samples are subject to frequencies greater than the line-width of the spectrum. Second-order quadrupolar interactions are not eliminated in this technique. This technique was suggested by Andrew and Lowe, who showed that Hamiltonians describing nuclear-nuclear dipolar interactions are proportional to "three cosine squared theta minus one." Those dipolar interactions are canceled out at its namesake orientation. For 10 points, name this technique in which samples are placed at a 54.74 degree angle with respect to the applied B-field and then rapidly rotated, which is heavily used in solid-state NMR.
This technique requires recoupling times in CODEX experiments that are achieved via synchronized pi pulses, as CODEX measures dynamics on the seconds-scale by detecting CSAs that are lost in this technique.
magic angle spinning NMR [or MAS NMR; prompt on "NMR" or "(ss)NMR" or "(solid state) NMR" until mentioned; accept "CODEX" until mentioned]