# al-zfilter-amplitude-selective-filtering-p2.in

# approach: filtering the desired coherences (-3Q and +3Q) after the first pulse
#           and (0Q, 4Q, and -4Q) 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 = 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 p1      4 
  variable p3      2 
}

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

  matrix set 1 coherence {-3 3}
  matrix set 2 coherence {0 -4 4}

  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
# -0.170321037 0.000210264555
# -1.188931 0.00108858413
# -3.23368091 0.00278334485
# -5.69539486 0.00486598161
# -7.62834034 0.0065171392
# -8.28697524 0.00687123602
# -7.40432146 0.00559341578
# -5.21936275 0.00322463159
# -2.40119832 0.000812231767
# 0.13669714 -0.000815735724
# 1.59523877 -0.00139815594
# 1.70566898 -0.00107267865
# 0.874740373 -0.000108566371
# -0.135239447 0.00115886125
# -0.703219596 0.00226738905
# -0.620698253 0.00273550463
# END