# al-zfilter-5Q-amplitude-selective-filtering-p2b.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 second-pulse duration
# in three-pulse z-filtered amplitude-modulated 5Q-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   40*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 {1}
  matrix set 2 coherence {-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
# 6.56207278e-07 -4.1261158e-09
# 1.84533499e-05 -1.23641624e-07
# 0.000111772038 -8.31500754e-07
# 0.000343662312 -2.90710701e-06
# 0.000705073566 -6.77209764e-06
# 0.0010876212 -1.1492542e-05
# 0.0013161715 -1.43027494e-05
# 0.00118607044 -1.14471559e-05
# 0.000486109147 -1.34976989e-07
# -0.000951624393 1.96591945e-05
# -0.0031479275 4.48161437e-05
# -0.00588053753 7.01974058e-05
# -0.00870718165 9.01567887e-05
# -0.0111309527 9.95025457e-05
# -0.012795658 9.42352263e-05
# -0.0135810584 7.28362784e-05
# END