# al-spam-echo-3Q-selective-filtering-p2.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 second-pulse duration # in three-pulse spam 3Q-MAS sequence, # the first-pulse duration p1 = 4 micro seconds # the third-pulse duration p3 = 2 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 p3 2 } 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} pulse $par(p1) $par(rf) x store 10 reset acq -y for {set i 1} {$i < $par(np)} {incr i} { reset prop 10 filter 1 pulse [expr ($i)*$par(tsw)] $par(rf) x filter 2 pulse $par(p3) $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 # -0.0633686745 -3.77648951e-17 # -0.335386192 -1.38086356e-17 # -0.973308634 -3.53719524e-17 # -1.98239879 -3.43249634e-17 # -3.14151327 -3.76877147e-17 # -4.06404257 -1.62495994e-16 # -4.36920076 -3.77554048e-16 # -3.86582779 -4.52052291e-16 # -2.64926301 -5.71771572e-16 # -1.06945125 -6.58601071e-16 # 0.401518484 -5.78395381e-16 # 1.33520809 -4.8511302e-16 # 1.48174021 -5.61723929e-17 # 0.83624889 -1.93447781e-16 # -0.37374321 -2.38953685e-16 # -1.7717808 -3.98098473e-16 # END