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

# oQ -> 3Q -> (5Q, 1Q, -3Q) -> -1Q
# approach: filtering the desired coherences (3Q) after the first pulse
#           and (5Q, 1Q, -3Q) 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     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   48*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9000
  variable p1      9
  variable p2      1
}

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

  matrix set 1 coherence {3}
  matrix set 2 coherence {5 1 -3}

  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
# 0.000784642169 6.78411364e-17
# 0.00518320276 3.07168743e-18
# 0.0147923086 -1.16052462e-16
# 0.028986108 -1.17285221e-16
# 0.0451360345 -3.87346079e-17
# 0.0593117502 1.88835653e-16
# 0.0674405239 5.58862756e-17
# 0.066458608 -2.867716e-17
# 0.0549443275 1.55179141e-17
# 0.0331544626 -1.70136634e-16
# 0.00252743246 -1.74483867e-16
# -0.0351379956 -1.71285252e-16
# -0.0784432135 -2.28300778e-17
# -0.126829055 1.91012712e-17
# -0.180577841 1.72526125e-16
# -0.240407921 1.61661354e-16
# -0.306940843 1.42244875e-16
# -0.380322405 1.44855785e-16
# -0.460107536 1.03900514e-16
# -0.545447108 2.66256609e-16
# -0.635462694 2.00393158e-16
# -0.729561243 8.46443943e-17
# -0.827557313 -4.18507247e-17
# -0.929589025 -4.28519587e-17
# -1.03584542 -1.19412651e-16
# -1.14623852 -3.99635746e-17
# -1.26022196 2.66894091e-17
# -1.37685312 7.08396651e-17
# -1.49505402 1.43680887e-16
# -1.61394776 9.12523282e-17
# -1.73313384 1.08833375e-16
# -1.85278532 1.47455212e-16
# -1.97350057 1.96408923e-16
# END