# al-zfilter-amplitude-24p2p3-filtering-p1c.in

# approach: filtering the desired coherences (-3Q and +3Q) after the first pulse
#           and (0Q) 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}

  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
# 1.31924713e-05 2.37197027e-09
# 0.000203968008 9.22278579e-07
# -8.51405145e-05 1.12226304e-05
# -0.00629378431 5.17506504e-05
# -0.0311245528 0.000139739369
# -0.0854374693 0.000267818213
# -0.165392448 0.000416613803
# -0.256374655 0.000593813258
# -0.343214152 0.000834532418
# -0.415610251 0.00115442703
# -0.474955304 0.00152807613
# -0.529617915 0.00191010906
# -0.579747312 0.00225722893
# -0.615677875 0.00253507
# -0.628295655 0.00271398536
# -0.615635134 0.00276815227
# END