# al-spam-echo_-5Q-selective-filtering-p3.in # approach: filtering the desired coherences (-5Q) after the first pulse # and (±5Q, ±4Q, ±3Q, ±2Q, ±1Q, and 0Q) after the second pulse # spin-5/2 echo amplitude optimization # versus the third-pulse duration # in three-pulse spam -5Q-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 20*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 {-5} matrix set 2 coherence {9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9} 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 # 0.979721664 -3.0025586e-016 # 1.01806 -3.75796009e-016 # 1.06388759 -4.26419983e-016 # 1.11727196 -4.77585001e-016 # 1.17793171 -5.62518648e-016 # 1.2451446 -6.13132352e-016 # 1.31775337 -7.0913709e-016 # 1.39426804 -7.51918805e-016 # 1.47303414 -7.99704512e-016 # 1.55241843 -8.52812886e-016 # 1.63096307 -9.47415801e-016 # 1.70747489 -1.02876508e-015 # 1.78104127 -1.06582599e-015 # 1.85098957 -1.17515181e-015 # 1.9168224 -1.23923298e-015 # 1.97816311 -1.28299997e-015 # END