This is a pulse program for one-dimensional 3Q-MAS experiment whatever the quadrupolar nuclei with half-integer spin I. The echo position is tau2 = k*tau1 where:
The delay tau1 should be very short, about 10 µs. The pulse lengths p1 and p2 must be optimized in order to obtain the biggest echo amplitude. In this pulse program, the CYCLOPS procedure is missing. As a result, the image of the line in the spectrum should be observed if the spectrometer frequency differs with the Larmor frequency.
ze 2 d1 tlo ; recycle duration d1 ; tlo set to drive HP X amplifier 10u:c4 p1:t:c4 ph1 ; the first-pulse duration p1 d6:c4 ; spacing between pulses p2:t:c4 ph2 ; the second-pulse duration p2 2u:c4 d7 ph0:r ; acquisition delay 3u adc aq ; acquisition 1m rcyc=2 ph3 ; loop to 2, NS times for averaging wr #0 exit ph0= 0 ph1=(6) 0 1 2 3 4 5 ; p1 pulse phase ph2= 0 ; p2 pulse phase ph3= 0 2 0 2 0 2 ; receiver phase