Nonadiabatic effects on rotating-frame dipolar relaxation time measurements.

Application of the T1Drho pulse sequence often leads to a two-component relaxation decay due to nonadiabatic effects near the magic angle thetam which creates a serious danger of T1Drho misinterpretation. These effects were studied in detail for various fluorides and it was discovered that three different sources of nonadiabaticity may occur during T1Drho measurements.