# al-zfilter-5Q-amplitude-selective-filtering-p3b.in

# approach: filtering the desired coherences (1Q) after the first pulse
#           and (-4Q) after the second pulse

# spin-5/2 echo and antiecho amplitude optimization
# versus the first-pulse duration
# in three-pulse z-filtered amplitude-modulated 5Q-MAS sequence,
# the first-pulse duration p1 = 4 micro seconds
# the second-pulse duration p2 = 4 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 2 3e6 0 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   40*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      4 
  variable p2      4
}

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

  matrix set 1 coherence {1}
  matrix set 2 coherence {-4}

  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 27Al: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -3.52518571e-05 7.94840873e-08
# -0.000310057774 5.83400032e-07
# -0.00107875199 1.93581681e-06
# -0.00249544248 5.05238186e-06
# -0.00455801126 1.17306083e-05
# -0.00715846006 2.43186703e-05
# -0.0101831973 4.46352889e-05
# -0.0135810584 7.28362784e-05
# -0.0173633434 0.000107203104
# -0.02155682 0.000145128715
# -0.0261616627 0.000184494695
# -0.0311513035 0.000224437519
# -0.036501209 0.000265244806
# -0.0422078436 0.000307819698
# -0.0482788804 0.000353313556
# -0.0547069673 0.000403161909
# END