# al-zfilter-amplitude-24p2p3-filtering-p1b.in

# approach: filtering the desired coherences (-5Q and +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 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 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   24*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p2      4 
  variable p3      2 
}

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

  matrix set 1 coherence {1 -5}
  matrix set 2 coherence {4}

  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
# -1.38838677e-06 1.49208562e-08
# -4.44322717e-06 3.15380807e-08
# -8.23134812e-06 4.49964625e-08
# -1.19499878e-05 5.44672164e-08
# -1.52433179e-05 6.33186663e-08
# -1.8142565e-05 7.59191182e-08
# -2.08225372e-05 9.4168378e-08
# -2.34071863e-05 1.15251614e-07
# -2.59030033e-05 1.31405243e-07
# -2.81877023e-05 1.32319239e-07
# -2.99868081e-05 1.08752401e-07
# -3.08712912e-05 5.44230955e-08
# -3.03530439e-05 -3.44421051e-08
# -2.80934957e-05 -1.5890266e-07
# -2.41502521e-05 -3.13791148e-07
# -1.91312035e-05 -4.83468957e-07
# END