About Excitation of a Quadrupole Spin Echo

Abstract

For the first time the excitation of a quadrupole spin echo by a sequence of radio frequency pulses with the filling frequencies ωQ and ωQ ± ΔωQ is theoretically and experimentally considered, where ωQ is the resonance frequency of the raised transition and ΔωQ the offset within the half-width of the NQR line. It is shown that in this case the amplitude of the observable signals does not depend on the offset size, and the echoes appear at times which depend on the intervals between pulses, on the ratio ΔωQ/ωQ, and on the offset sign.