# al-zfilter-5Q-amplitude-selective-filtering-p1a.in

# approach: filtering the desired coherences (-1Q) after the first pulse
#           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     rep100
  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 {-1}
  matrix set 2 coherence {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
# -5.86869624e-06 1.42547338e-07
# -1.15764566e-05 3.17920072e-07
# -1.73587596e-05 5.21360758e-07
# -2.3476919e-05 7.41507467e-07
# -2.97767764e-05 9.60870594e-07
# -3.55912916e-05 1.15942926e-06
# -3.98875137e-05 1.31907548e-06
# -4.14657818e-05 1.42606805e-06
# -3.91671193e-05 1.47071895e-06
# -3.21205634e-05 1.44632788e-06
# -1.99918249e-05 1.34977665e-06
# -3.15499296e-06 1.18395806e-06
# 1.72590758e-05 9.60153253e-07
# 3.94748356e-05 6.98462432e-07
# 6.13875331e-05 4.25410806e-07
# 8.10364279e-05 1.68553622e-07
# END