# al-shifted-echo-amplitude-selective-24-filtering-p3.in # approach: filtering the desired coherences (-3Q and +3Q) after the first pulse # and (+1Q, +5Q, and -3Q) after the second pulse # spin-5/2 echo and antiecho amplitude optimization # versus the third-pulse duration # in three-pulse shifted-echo amplitude-modulated 3Q-MAS sequence, # the first-pulse duration p1 = 4 micro seconds # the second-pulse duration p2 = 4 micro seconds spinsys { channels 27Al nuclei 27Al quadrupole 1 1 1e6 1 0 0 0 } par { spin_rate 5000 variable tsw 0.25 sw 1.0e6/tsw np 17 crystal_file rep10 gamma_angles 10 proton_frequency 800e6 start_operator 24*I1z detect_operator I1c verbose 1101 variable rf 90000 variable rf3 9300 variable p1 4 variable p2 4 } proc pulseq {} { global par maxdt $par(tsw) matrix set 1 coherence {-3 3} matrix set 2 coherence {1 5 -3} acq -y pulse $par(p1) $par(rf) x filter 1 pulse $par(p2) $par(rf) x filter 2 for {set i 1} {$i < $par(np)} {incr i} { pulse $par(tsw) $par(rf3) x acq -y } } proc main {} { global par fsave [fsimpson] $par(name).fid puts "Larmor frequency (Hz) of 27Al: " puts [resfreq 27Al $par(proton_frequency)] } # SIMP # NP=17 # SW=4000000 # TYPE=FID # DATA # 0 0 # -0.00207507874 4.0293517e-17 # -0.00810594218 -1.40702414e-17 # -0.0173160631 1.17444257e-17 # -0.0285257284 -4.42164074e-17 # -0.0404735825 -6.55848225e-17 # -0.052064185 -1.33729883e-16 # -0.0624837449 -2.06473059e-16 # -0.0711900543 -2.48540003e-16 # -0.0778273411 -1.86810089e-16 # -0.0821294114 -6.19509935e-17 # -0.0838585098 -2.05237077e-16 # -0.0827974967 -3.72445561e-16 # -0.0787859935 -4.67831358e-16 # -0.0717775787 -4.56024175e-16 # -0.0618956384 -4.20366613e-16 # -0.0494733329 -4.23469416e-16 # END