# al-zfilter-5Q-amplitude-selective-filtering-p1c.in

# approach: filtering the desired coherences (-5Q and +5Q) after the first pulse
#           and (0Q) 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 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   40*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 {-5 5}
  matrix set 2 coherence {0}

  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
# -7.69075196e-10 2.77150198e-13
# -3.54782864e-07 1.32850566e-10
# -1.142789e-05 4.76065066e-09
# -0.000120576422 5.73760131e-08
# -0.000681403681 3.83925187e-07
# -0.00257212732 1.7904652e-06
# -0.00730127176 6.52355221e-06
# -0.0167965772 1.97282766e-05
# -0.0330972394 5.11785844e-05
# -0.0583473661 0.000115951869
# -0.0949857959 0.000232015459
# -0.145506082 0.000414061557
# -0.211420789 0.000666114603
# -0.291837112 0.000977213262
# -0.38255827 0.00132273378
# -0.476373601 0.0016703603
# END