# al-zfilter-amplitude-12p2p3-filtering-p1a.in

# approach: filtering the desired coherences (-1Q and +5Q) after the first pulse
#           and (2Q and -4Q) after the second pulse

# spin-5/2 echo and antiecho amplitude optimization
# versus the first-pulse duration
# in three-pulse z-filtered amplitude-modulated 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 2 3e6 0 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.25
  sw               1.0e6/tsw
  np               34
  crystal_file     rep100
  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 {-1 5}
  matrix set 2 coherence {2 -4}

  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
# -0.00592340695 -2.48654837e-06
# -0.0125285336 -6.09216789e-06
# -0.0188388507 -1.18484075e-05
# -0.0240656276 -1.98286528e-05
# -0.0278159779 -2.94650201e-05
# -0.0300504351 -3.9854487e-05
# -0.030904478 -5.00796246e-05
# -0.0305273234 -5.94504673e-05
# -0.0290180888 -6.7430374e-05
# -0.0264442246 -7.3438877e-05
# -0.0228914377 -7.690548e-05
# -0.0185289172 -7.76861759e-05
# -0.0136708349 -7.65937861e-05
# -0.00877595173 -7.53746673e-05
# -0.00433735706 -7.55750684e-05
# -0.000725257492 -7.70306912e-05
# 0.00188324311 -7.7703593e-05
# 0.00346416507 -7.53133258e-05
# 0.00408221733 -6.91420165e-05
# 0.00386160914 -6.02845339e-05
# 0.00298704074 -5.03392616e-05
# 0.00168634455 -4.01206003e-05
# 0.0001813804 -2.97235646e-05
# -0.00133159225 -1.94261473e-05
# -0.00264328133 -9.99696389e-06
# -0.00349693784 -2.032677e-06
# -0.00362569741 4.8439415e-06
# -0.00285205575 1.20504358e-05
# -0.00117650426 2.12500326e-05
# 0.00120282623 3.32780056e-05
# 0.00393846195 4.74111545e-05
# 0.0066194302 6.12504335e-05
# 0.00887169503 7.13327768e-05
# END