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 extrem ely short RF pulses which are difficult (sometimes impossible) to achi eve. Ways out are composite and shaped pulses or using pulses shorter than 90 degrees. We focus our attention on the latter and show a simpl e method to avoid phase and amplitude distortions that arise in this c ase. Our method does not require additional spectrometer hardware, pul se sequences or additional data manipulation. It works well with sampl es with constant quadrupole coupling constants and seems particularly useful in cases of inhomogeneous RF fields, i.e. when large sample vol umes exceed the homogeneity region of the RF coil.