# na-shifted-echo-echo-selective-phase-filtering-p2.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 second-pulse duration # in three-pulse shifted-echo phase-modulated -3Q-MAS sequence, # the first-pulse duration p1 = 4 micro seconds # the third-pulse duration p3 = 2 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 p3 2 } proc pulseq {} { global par maxdt $par(tsw) matrix set 1 coherence {-3} matrix set 2 coherence {1 -3} 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 23Na: " puts [resfreq 23Na $par(proton_frequency)] } # SIMP # NP=17 # SW=4000000 # TYPE=FID # DATA # 0 0 # 0.198508433 -4.67765736e-17 # 0.190703865 -4.34116234e-17 # 0.180433993 -4.28605394e-17 # 0.170914671 -4.21798257e-17 # 0.165089525 -4.06828896e-17 # 0.164781445 -3.95731251e-17 # 0.170253421 -4.33184217e-17 # 0.180251331 -4.44196364e-17 # 0.192436016 -4.49867719e-17 # 0.204020213 -4.73878359e-17 # 0.212418803 -4.42051817e-17 # 0.215768752 -4.94374786e-17 # 0.213238308 -4.96748665e-17 # 0.205099125 -5.1160661e-17 # 0.192577157 -4.9188964e-17 # 0.177534498 -6.05555307e-18 # END