A SIMPLE METHOD TO AVOID PHASE AND AMPLITUDE DISTORTIONS IN H-2 NMR SOLID ECHO EXPERIMENTS

To obtain undistorted deuteron solid-state NMR spectra requires extremely short RF pulses which are difficult (sometimes impossible) to achieve. Ways out are composite and shaped pulses or using pulses shorter than 90 degrees. We focus our attention on the latter and show a simple method to avoid phase and amplitude distortions that arise in this case. Our method does not require additional spectrometer hardware, pulse sequences or additional data manipulation. It works well with samples with constant quadrupole coupling constants and seems particularly useful in cases of inhomogeneous RF fields, i.e. when large sample volumes exceed the homogeneity region of the RF coil.