Abstract: For the strong radiation damping case(i.e.,90%H₂O in D₂O), it has been found experimentally that when the initial angle of the magnetization relative to the B₀ direction, θ₀, is very close to π, the Fourier transformed spectra corresponding to the FIDs with hyperbolic envelope are characteristic of very strong oscillation, which is apparently different from that obtained with near-π pulse. This great oscillating feature can be reasonably explained in terms of the radiation damping lineshape theory.

Key words: FT-NMR, Lineshape, Radiation damping, Oscillation