# al-zfilter-5Q-amplitude-selective-filtering-p2a.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 second-pulse duration
# in three-pulse z-filtered amplitude-modulated 5Q-MAS sequence,
# the first-pulse duration p1 = 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 p1      4 
  variable p3      2 
}

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

  matrix set 1 coherence {-1}
  matrix set 2 coherence {4}

  pulse  $par(p1) $par(rf) x
  store 10

  reset
  acq -y        
  for {set i 1} {$i < $par(np)} {incr i} {
    reset
    prop 10
    filter 1
    pulse [expr ($i)*$par(tsw)] $par(rf) x 
    filter 2
    pulse $par(p3) $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
# -4.38067625e-09 -1.60395529e-11
# -1.26937274e-07 -4.55064852e-10
# -7.75678643e-07 -2.94433465e-09
# -2.35788461e-06 -1.00534637e-08
# -4.6972426e-06 -2.29535222e-08
# -6.93966569e-06 -3.7687432e-08
# -7.9780979e-06 -4.33923226e-08
# -6.78245126e-06 -2.55832421e-08
# -2.36539342e-06 2.63136804e-08
# 6.24473905e-06 1.1092503e-07
# 1.94838641e-05 2.11712703e-07
# 3.63241995e-05 3.02518311e-07
# 5.39659499e-05 3.58002393e-07
# 6.88276378e-05 3.59970146e-07
# 7.81569367e-05 2.97635713e-07
# 8.10364279e-05 1.68553622e-07
# END