# al-zfilter-amplitude-12p2p3-filtering-p2a.in

# approach: filtering the desired coherences (-1Q and +5Q) after the first pulse
#           and (2Q 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 = 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 {-1 5}
  matrix set 2 coherence {2 -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
# 5.32560503e-05 3.75831856e-07
# 0.000489680233 3.17340548e-06
# 0.00191058426 1.12600714e-05
# 0.00505926282 2.72933936e-05
# 0.0103350401 5.08453485e-05
# 0.0172431277 7.53880937e-05
# 0.0243231701 9.00144886e-05
# 0.0296608996 8.64894619e-05
# 0.0316113522 6.56463453e-05
# 0.029260702 3.67300891e-05
# 0.0225097054 1.02775875e-05
# 0.0120443385 -8.30809379e-06
# -0.000649884136 -1.93908836e-05
# -0.0134046742 -2.61557862e-05
# -0.0238316575 -3.21747675e-05
# -0.0300504351 -3.9854487e-05
# -0.0313161151 -4.91191147e-05
# -0.0282260185 -5.74552998e-05
# -0.0224280977 -6.21449636e-05
# -0.0159451469 -6.32275097e-05
# -0.0103751608 -6.42098094e-05
# -0.00632371882 -6.98834293e-05
# -0.00338028299 -8.47871494e-05
# -0.00067042154 -0.000113722777
# 0.00239608739 -0.000160135075
# 0.00567604512 -0.000220877844
# 0.00832338711 -0.000282930844
# 0.00915498156 -0.0003270038
# 0.00715332471 -0.000336708297
# 0.00198470313 -0.000307195503
# -0.00560937383 -0.000247084185
# -0.0137819026 -0.000172178691
# -0.0201232515 -9.98181636e-05
# END