# al-zfilter-5Q-amplitude-selective-filtering-p1.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 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               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 p2      4 
  variable p3      2 
}

proc pulseq {} {
  global par
  maxdt $par(tsw)

  matrix set 1 coherence {-5 5}
  matrix set 2 coherence {0 -4 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
# -8.96134412e-10 4.10766353e-13
# -4.1093576e-07 -1.5958076e-10
# -1.31618321e-05 -9.76615304e-09
# -0.000137617074 -1.32421116e-07
# -0.000765709589 -8.38545986e-07
# -0.00282249345 -3.21452386e-06
# -0.00775151103 -8.3734588e-06
# -0.0170739679 -1.5305844e-05
# -0.0318727451 -1.78129447e-05
# -0.0528344129 -2.91147281e-06
# -0.0808893647 4.66312987e-05
# -0.117649189 0.000145439983
# -0.164849507 0.000297826123
# -0.222891079 0.000493960454
# -0.289446932 0.000712122643
# -0.359148753 0.0009253913
# END