# al-zfilter-5Q-amplitude-selective-filtering-p1b.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 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 {1}
  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
# 0.000944449111 2.46369422e-05
# 0.00187998007 5.46011259e-05
# 0.00283694517 8.88447562e-05
# 0.00384943636 0.000125193692
# 0.00489027544 0.000160701734
# 0.00585140029 0.000192362997
# 0.00656381079 0.000217764664
# 0.00683100956 0.000235322331
# 0.00646367956 0.000244059288
# 0.00531729843 0.000243278567
# 0.00333068525 0.000232531304
# 0.000556228588 0.00021195017
# -0.00282845634 0.000182697011
# -0.00653771383 0.000147238172
# -0.0102297411 0.000109231859
# -0.0135810584 7.28362784e-05
# END