# al-spam-echo-3Q-selective-filtering-p3.in # approach: filtering the desired coherences (3Q) 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 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 12*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} 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 # -1.01960994 -2.65941319e-16 # -1.16326606 -3.42405064e-16 # -1.29689289 -3.31040172e-16 # -1.41875902 -3.58864804e-16 # -1.5275976 -3.3549299e-16 # -1.62269124 -3.1331943e-16 # -1.70392475 -3.30529081e-16 # -1.7717808 -3.5288622e-16 # -1.82727102 -3.1947936e-16 # -1.87181497 -2.00379765e-16 # -1.90709388 -1.92552941e-16 # -1.93490994 -2.03693328e-16 # -1.95707444 -1.51473003e-16 # -1.97533371 -3.15083519e-17 # -1.99132573 1.13380405e-16 # -2.00655016 1.61284723e-16 # END