# na-shifted-echo-amplitude-filtering-p1.in

# approach: filtering the desired coherences (-3Q and +3Q) after the first pulse
#           and (+1Q) after the second pulse

# spin-3/2 echo and antiecho amplitude optimization
# versus the first-pulse duration
# in three-pulse shifted-echo amplitude-modulated 3Q-MAS sequence,
# the second-pulse duration p2 = 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     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   48*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     93000
  variable p2      4 
  variable p3      2 
}

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

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

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

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -8.7396673e-06 -3.04599413e-18
# -0.000251127405 2.71498216e-17
# -0.00156951317 1.31146445e-17
# -0.00494267231 2.30663452e-18
# -0.0100401655 4.23557963e-18
# -0.0142306304 6.17003572e-18
# -0.0135174676 -6.46164187e-17
# -0.00535945185 -4.40928844e-17
# 0.00855943326 -8.11250669e-17
# 0.0221108228 -1.59590147e-16
# 0.0280330927 -1.02034559e-16
# 0.0231043514 -1.7850372e-16
# 0.0117569335 -2.48224788e-16
# 0.0053601099 -2.5759217e-16
# 0.0171657603 -2.393821e-16
# 0.0558592671 -4.48048201e-17
# END