# al-spam-echo-3Q-selective-filtering-p1.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 first-pulse duration # in three-pulse spam 3Q-MAS sequence, # the second-pulse duration p2 = 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 p2 4 variable p3 2 } proc pulseq {} { global par maxdt $par(tsw) matrix set 1 coherence {3} matrix set 2 coherence {9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9} acq -y for {set i 1} {$i < $par(np)} {incr i} { pulse $par(tsw) $par(rf) x store 2 filter 1 pulse $par(p2) $par(rf) x filter 2 pulse $par(p3) $par(rf3) x acq -y reset prop 2 } } 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 # -5.80617937e-07 -2.67490334e-16 # -0.000178750904 -2.93972195e-16 # -0.00239501066 -5.72281056e-17 # -0.0132690557 -1.03822968e-16 # -0.045926636 1.20042215e-16 # -0.117539787 2.43286855e-16 # -0.242810123 3.69384975e-16 # -0.426754533 5.39980953e-16 # -0.660913172 1.08847474e-15 # -0.924878509 1.63382678e-15 # -1.19172089 1.99061554e-15 # -1.43403483 1.82993652e-15 # -1.6280614 5.42995512e-16 # -1.75557181 -3.33243558e-16 # -1.80483022 -9.25602222e-16 # -1.7717808 -1.51510322e-15 # END