# na-zfilter-amplitude-filtering-p1.in

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

# spin-3/2 echo and antiecho amplitude optimization
# versus the first-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the second-pulse duration p2 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 23Na
  nuclei   23Na
  quadrupole 1 1 1e6 1 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     93000
  variable p2      4 
  variable p3      2 
}

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

  matrix set 1 coherence {-3 3}
  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 23Na: "
  puts [resfreq 23Na $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -7.69414168e-06 1.15928264e-19
# -0.000260120263 -4.90439268e-18
# -0.00208699296 -6.90363519e-18
# -0.00917055779 -4.02855309e-18
# -0.0284756245 -4.13062012e-18
# -0.0698140935 2.40737792e-18
# -0.143359523 2.93225295e-17
# -0.255628855 3.03587097e-17
# -0.405736241 3.9948957e-17
# -0.584073994 8.22103209e-17
# -0.774530277 7.38182649e-17
# -0.95945329 1.06515544e-16
# -1.12502936 1.1831554e-16
# -1.26457703 7.71159559e-17
# -1.37855649 1.03493488e-16
# -1.47195351 2.01724454e-16
# END