# al-split-t1-echo-selective-phase-filtering-p1.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 first-pulse duration
# in three-pulse split-t1 phase-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 1 3e6 1 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.5
  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 p2      4 
  variable p3      2 
}

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

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

  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
# -0.000685209338 -6.25104857e-20
# -0.0133621968 1.38187587e-18
# -0.073438793 4.20956062e-17
# -0.177974954 8.60906662e-17
# -0.276409656 4.59784938e-17
# -0.350511249 4.36769983e-17
# -0.418988113 2.01165407e-16
# -0.489066376 9.0281379e-17
# -0.540587541 -2.96787572e-17
# -0.541199235 2.51617757e-17
# -0.487321649 5.43608304e-17
# -0.401648033 8.72123479e-17
# -0.314194558 1.60592604e-16
# -0.238447304 7.23459903e-17
# -0.165826822 -3.04091048e-16
# -0.0959536221 -2.68018273e-16
# -0.0478289791 3.5974422e-17
# -0.0370582527 -2.17438821e-16
# -0.057632351 -6.36140996e-16
# -0.0914969318 -2.50523848e-16
# -0.10386823 2.2689425e-17
# -0.0909332183 -2.75034345e-16
# -0.0881315657 -2.82491927e-16
# -0.0976315833 -1.42172929e-16
# -0.116685574 2.70344127e-16
# -0.141716467 2.15573511e-16
# -0.173295533 -5.9850889e-17
# -0.218664133 -1.3467447e-16
# -0.249605394 -6.4103056e-17
# -0.253860842 4.7032768e-16
# -0.218680498 5.57609863e-16
# -0.131366224 4.65740468e-16
# -0.0476156066 2.18371877e-16
# END