# al-two-pulse-phase-filtering-5Q-p2.in

# approach: filtering the desired coherences (-5Q) after the first pulse

# spin-5/2 central-transition echo amplitude optimization
# versus the second-pulse duration
# in two-pulse phase-modulated -5Q-MAS sequence,
# the first-pulse duration p1 = 5 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 2 3e6 0 0 0 0
}

par {
  proton_frequency 400e6
  spin_rate        10000
  variable tsw     0.5
  sw               1.0e6/tsw
  np               41
  crystal_file     rep100
  gamma_angles     10
  start_operator   40*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      100000
  variable p1      5
}

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

  matrix set 1 coherence {-5}

  acq
  pulse $par(p1) $par(rf) x
  filter 1

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

proc main {} {
  global par

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

# SIMP
# NP=41
# SW=2000000
# TYPE=FID
# DATA
# 0 0
# 0.176159116 0.00344891795
# 1.71451858 0.0370992119
# 4.01916654 0.0969502839
# 4.8465774 0.140470285
# 4.08572745 0.152408959
# 2.85891549 0.137861752
# 1.84583185 0.115309235
# 1.11331055 0.0897879435
# 1.09019077 0.0804197902
# 1.68757427 0.08845536
# 2.21380475 0.103635502
# 2.23203231 0.117085543
# 1.99579939 0.115870799
# 2.00869967 0.112776759
# 2.19927363 0.124086815
# 2.31999675 0.145345095
# 2.34689046 0.139594733
# 2.83273657 0.122955726
# 3.91921674 0.151446837
# 4.89550905 0.231861674
# 4.85578138 0.295465593
# 3.88344877 0.279719775
# 3.07795505 0.233237144
# 3.1455765 0.245871601
# 3.65113612 0.300086214
# 4.02276744 0.331207513
# 4.12738991 0.334191811
# 4.0817322 0.360004701
# 3.79022498 0.391891679
# 3.32801012 0.393708783
# 3.196667 0.394132564
# 3.47852044 0.417040208
# 3.80496358 0.427577416
# 4.24179371 0.425800083
# 4.74786661 0.438724491
# 4.75263761 0.463149636
# 4.26166786 0.481484962
# 4.18084679 0.535017351
# 4.6903272 0.643819173
# 5.24764753 0.741199498
# END