LINE-SHAPES OF STRONGLY RADIATION-DAMPED NUCLEAR-MAGNETIC-RESONANCE SIGNALS

Line shapes of strongly radiation-damped nuclear magnetic resonance (NMR) signals are theoretically analyzed. Analytical expressions for the radiation-damped signals in the frequency domain are reported for the first time. It is shown that the line shapes are generally dependent on the flip angle theta0 of the excitation pulse. In the range of 0 less-than-or-equal-to theta0 < pi, the peak height increases linearly, but the linewidth decreases monotonically with the flip angle. An oscillating feature is predicted for the line shape when theta0 > pi/2. The theoretical predictions are confirmed by the experimental results.