# al-zfilter-5Q-amplitude-selective-filtering-p3.in

# approach: filtering the desired coherences (-5Q and +5Q) after the first pulse
#           and (0Q, -4Q, 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 5Q-MAS sequence,
# the first-pulse duration p1 = 4 micro seconds
# the second-pulse duration p2 = 4 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               17
  crystal_file     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   40*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 {-5 5}
  matrix set 2 coherence {0 -4 4}

  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 27Al: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -0.0456710829 1.87426195e-05
# -0.091248182 7.31317448e-05
# -0.136718387 0.000157536621
# -0.182064898 0.00026593005
# -0.22718744 0.000395458144
# -0.27189118 0.000547134879
# -0.315942073 0.00072353647
# -0.359148753 0.0009253913
# -0.401412321 0.00114983467
# -0.442708372 0.00139195546
# -0.483029005 0.00164823114
# -0.522345351 0.00191863945
# -0.560613911 0.00220595804
# -0.597803179 0.00251359846
# -0.633913333 0.00284404403
# -0.668976472 0.00319887907
# END