# al-zfilter-amplitude-12p2p3-filtering-p2c.in

# approach: filtering the desired coherences (-3Q and +3Q) after the first pulse
#           and (0Q) after the second pulse

# spin-5/2 echo and antiecho amplitude optimization
# versus the second-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 1.5 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               34
  crystal_file     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   12*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      1.5 
  variable p3      2 
}

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

  matrix set 1 coherence {-3 3}
  matrix set 2 coherence {0}

  pulse  $par(p1) $par(rf) x
  store 10

  reset
  acq -y        
  for {set i 1} {$i < $par(np)} {incr i} {
    reset
    prop 10
    filter 1
    pulse [expr ($i)*$par(tsw)] $par(rf) x 
    filter 2
    pulse $par(p3) $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
# -0.0145403551 1.1987838e-05
# -0.0982571592 7.0815631e-05
# -0.24943871 0.000177309002
# -0.399531533 0.000332798959
# -0.477239048 0.000501932039
# -0.455672153 0.000564561596
# -0.350588741 0.000426155127
# -0.201866466 0.000158227561
# -0.0540102371 -6.55486398e-05
# 0.0537548742 -0.000150886524
# 0.0896467582 -0.000132281997
# 0.0540023591 -8.36041014e-05
# -0.00854204779 -3.66198502e-05
# -0.0496525296 2.15931594e-05
# -0.0559439611 9.04625042e-05
# -0.0427187346 0.000133909106
# -0.0294410825 0.000136373069
# -0.028920052 0.000128147242
# -0.0525192727 0.00013032294
# -0.110535597 0.000123413971
# -0.198154513 9.1031572e-05
# -0.284928257 5.8108606e-05
# -0.331938672 6.35900896e-05
# -0.3247079 0.000105827794
# -0.276099649 0.000131797722
# -0.203722891 9.85929712e-05
# -0.124061432 3.10781657e-05
# -0.0554152376 -1.84249028e-05
# -0.0130435725 -3.68990722e-05
# -0.00289142796 -3.36256351e-05
# -0.0112548543 -1.91130105e-07
# -0.00917071321 7.59991417e-05
# 0.019055594 0.000178451702
# END