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VOLUME 37 (1983) | ISSUE 8 | PAGE 383
2ω echo in a system with dynamic frequency shift (antiferromagnetic MnCO3)
The response of the electron-nuclear spin system to the second harmonic of the resonant frequency is investigated using the spin-echo technique. The specimen emits the second harmonic both during the action of the resonant pulse and during the time that the echo signal exists. Additional echoes, which exist only at the second-harmonic frequency, are observed. A spin echo is observed from nuclear spin waves with Κ Φ 0 in a sequence with two parametric pulses.