# al-split-t1-echo-phase-filtering-p3.in

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

# spin-5/2 echo amplitude optimization
# versus the third-pulse duration
# in three-pulse split-t1 phase-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 9 micro seconds
# the second-pulse duration p2 = 1 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 1 3e6 1 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.25
  sw               1.0e6/tsw
  np               34
  crystal_file     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   96*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     90000
  variable p1      9
  variable p2      1
}

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

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

  acq -y        
  pulse  $par(p1) $par(rf) x
  filter 1
  pulse  $par(p2) $par(rf) x
  filter 2

  for {set i 1} {$i < $par(np)} {incr i} {
    pulse $par(tsw) $par(rf3) x 
    acq -y
  }
}

proc main {} {
  global par

  fsave [fsimpson] $par(name).fid
  puts "Larmor frequency (Hz) of 23Na: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# 0.154920405 -3.75276539e-16
# 0.743556466 -1.17082686e-15
# 1.28550259 -2.25318583e-15
# 0.664035368 -2.49793378e-15
# -2.13624432 -1.13840207e-15
# -7.20995796 5.17141619e-16
# -13.3320502 2.77402752e-15
# -18.3668067 5.14565729e-15
# -20.3272547 6.17557083e-15
# -18.4306837 5.63066448e-15
# -13.4899886 3.79372596e-15
# -7.40362317 1.75082449e-15
# -2.11851943 -2.83388014e-16
# 1.26525627 -2.14995546e-15
# 2.76741745 -3.01292212e-15
# 3.13594975 -3.15160531e-15
# 3.17180728 -2.96905487e-15
# 3.22446638 -2.50174361e-15
# 3.07790859 -2.26340759e-15
# 2.18781702 -2.1504027e-15
# 0.0522594512 -1.56627801e-15
# -3.48536442 -2.03692162e-16
# -8.07003457 1.70178778e-15
# -12.8393641 3.69821556e-15
# -16.6359978 5.04891377e-15
# -18.4074521 5.76791622e-15
# -17.6495193 5.00572471e-15
# -14.6597964 2.87840285e-15
# -10.4325231 8.57924558e-16
# -6.19924696 -6.60794941e-16
# -2.85693548 -5.30534581e-16
# -0.658782996 3.68876552e-17
# 0.650006115 6.14725556e-16
# END