# al-shifted-echo-amplitude-selective-40-filtering-p3.in # approach: filtering the desired coherences (-5Q and +5Q) after the first pulse # and (5Q, 1Q, and -3Q) after the second pulse # spin-5/2 echo and antiecho amplitude optimization # versus the first-pulse duration # in three-pulse shifted-echo amplitude-modulated 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 2 3e6 0 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 40*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 5} matrix set 2 coherence {5 1 -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 # -0.000573126484 3.10604836e-05 # -0.00204592708 0.000127119534 # -0.00368208794 0.000305222846 # -0.00461590225 0.000586394934 # -0.00427405157 0.000980250631 # -0.00254646882 0.00147946153 # 0.000341083449 0.00206523735 # 0.0041292242 0.00271822963 # 0.00878841512 0.00342718789 # 0.0145554968 0.00418926324 # 0.0217505552 0.00500323955 # 0.0305732981 0.0058641907 # 0.0410344372 0.00676464129 # 0.0529958858 0.0076980317 # 0.066233641 0.00865866336 # 0.0804957629 0.00963819693 # END