# al-shifted-echo-amplitude-selective-24-filtering-p1.in

# approach: filtering the desired coherences (-3Q and +3Q) after the first pulse
#           and (+1Q, +5Q, and -3Q) after the second pulse

# spin-5/2 echo and antiecho amplitude optimization
# versus the first-pulse duration
# in three-pulse shifted-echo amplitude-modulated 3Q-MAS sequence,
# the second-pulse duration p2 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 1 1e6 1 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.25
  sw               1.0e6/tsw
  np               17
  crystal_file     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   24*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p2      4 
  variable p3      2 
}

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

  matrix set 1 coherence {-3 3}
  matrix set 2 coherence {1 5 -3}

  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 27Al: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -2.49986053e-06 -1.8279547e-17
# -5.9753281e-05 -2.24572409e-17
# -0.000320489123 -1.98684913e-17
# -0.000911841217 -4.37833559e-17
# -0.00183884169 -7.3712583e-18
# -0.003077452 -4.66601573e-18
# -0.00475320479 -1.57855823e-18
# -0.00715666491 -1.8199854e-17
# -0.010508337 4.36514977e-18
# -0.0146892565 4.2515286e-17
# -0.0192816736 9.7064006e-17
# -0.0240507372 -8.52564403e-18
# -0.0295971689 -1.39513561e-16
# -0.037669672 -1.90172476e-16
# -0.0507767623 -3.27676214e-16
# -0.0711900543 -4.43783559e-16
# END