# na-zfilter-amplitude-p2half-filtering-p2.in

# approach: filtering the desired coherences (-3Q and +3Q) after the first pulse
#           and (2Q, 0Q, and -2Q) after the second pulse

# spin-3/2 echo and antiecho amplitude optimization
# versus the second-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 23Na
  nuclei   23Na
  quadrupole 1 1 1e6 1 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   24*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     93000
  variable p1      4 
  variable p3      2 
}

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

  matrix set 1 coherence {-3 3}
  matrix set 2 coherence {2 0 -2}

  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 23Na: "
  puts [resfreq 23Na $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -0.740892714 3.2915833e-16
# -1.26310063 5.66544136e-16
# -1.57285154 4.92115853e-16
# -1.70312398 8.31983832e-16
# -1.69172165 1.09019942e-15
# -1.57380998 7.66630068e-16
# -1.38648084 7.40373511e-16
# -1.1741252 1.02794841e-15
# -0.985056587 7.20408355e-16
# -0.859144239 7.19300343e-16
# -0.814950495 4.88192887e-16
# -0.846110081 3.06398454e-16
# -0.929975788 3.55129355e-16
# -1.04264292 1.5511968e-17
# -1.17036647 -8.46559256e-17
# -1.31087705 -1.41767808e-16
# END