Beschreibung:
<jats:p>We demonstrate both theoretically and experimentally that the two-pulse sequence (2<jats:sub>n</jats:sub>+1)· 90ᵒ<jats:sub>Y</jats:sub>- 90ᵒ<jats:sub>X</jats:sub>-Acq(t )without delay between the pulses yields the reverse of the time evolution of spin systems with quadrupole interactions. This process results in refocusing of the spin magnetization into a magic echo at t<jats:sub>e</jats:sub> = t<jats:sub>1/</jats:sub>2 after the second pulse, where t<jats:sub>1</jats:sub> is the length of the first pulse. 33.25.+k; 76.20.+q; 76.60.-k; 76.60.Lz</jats:p>