# na-shifted-echo-echo-selective-phase-filtering-p3.in # approach: filtering the desired coherence (-3Q) after the first pulse # and (1Q and -3Q) after the second pulse # spin-3/2 echo amplitude optimization # versus the third-pulse duration # in three-pulse shifted-echo-echo phase-modulated -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 rep100 gamma_angles 10 proton_frequency 800e6 start_operator 48*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 {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 23Na: " puts [resfreq 23Na $par(proton_frequency)] } # SIMP # NP=17 # SW=4000000 # TYPE=FID # DATA # 0 0 # 0.00438408516 1.58309571e-17 # 0.0171497615 5.15221558e-18 # 0.036937837 6.71841232e-18 # 0.0617361452 6.46794815e-18 # 0.0894591546 7.21990019e-18 # 0.118468585 -1.71469837e-18 # 0.147871976 5.37853202e-18 # 0.177534498 2.63833953e-17 # 0.20785289 2.37727447e-18 # 0.239421329 2.52413124e-18 # 0.272737166 6.35303998e-18 # 0.308049671 4.26763318e-18 # 0.345373981 1.78336633e-18 # 0.384615401 -1.08456204e-17 # 0.425709657 -2.40731721e-17 # 0.468695561 -3.88084595e-17 # END