# na-spam-echo-selective-filtering-p3.in # approach: filtering the desired coherences (-3Q) after the first pulse # and (±3Q, ±2Q, ±1Q, and 0Q) after the second pulse # spin-3/2 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 23Na nuclei 23Na 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 23Na: " puts [resfreq 23Na $par(proton_frequency)] } # SIMP # NP=17 # SW=4000000 # TYPE=FID # DATA # 0 0 # 1.30599626 -9.09685332e-17 # 1.32848984 -8.48152592e-17 # 1.3604531 -1.02821421e-16 # 1.39526721 -9.28736338e-17 # 1.42671865 -9.23823257e-17 # 1.4505094 -1.01016715e-16 # 1.46500677 -1.07161315e-16 # 1.47108365 -1.08814749e-16 # 1.47125644 -9.65542313e-17 # 1.46854984 -8.15962875e-17 # 1.46553 -8.3354153e-17 # 1.46377976 -7.31053921e-17 # 1.46384819 -7.33151986e-17 # 1.4655134 -8.94908048e-17 # 1.46812813 -9.73042531e-17 # 1.47087523 -1.09374907e-16 # END