# al-zfilter-amplitude-selective-filtering-p1.in

# approach: filtering the desired coherences (-3Q and +3Q) 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 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               17
  crystal_file     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   24*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 {-3 3}
  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
# 1.31093213e-05 -7.2115325e-10
# 0.000201461709 8.31513108e-07
# -0.000101731476 1.06064354e-05
# -0.00635128998 4.96451096e-05
# -0.031265886 0.000135032244
# -0.0857256431 0.000259899851
# -0.165919748 0.000405383733
# -0.25726046 0.000578893024
# -0.344574708 0.000814925518
# -0.417513705 0.0011295155
# -0.477405107 0.00149884404
# -0.532584624 0.00187890172
# -0.583214297 0.00222614784
# -0.619658612 0.00250461872
# -0.632815652 0.00268311913
# -0.620698253 0.00273550463
# END