# al-split-t1-echo-selective-phase-filtering-p2.in

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

# spin-5/2 echo amplitude optimization
# versus the second-pulse duration
# in three-pulse split-t1 phase-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 9 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 1 3e6 1 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.25
  sw               1.0e6/tsw
  np               34
  crystal_file     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   48*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9000
  variable p1      9
  variable p3      2 
}

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

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

  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
# -0.000162918058 -3.75180431e-17
# 0.0139680169 -4.90304728e-17
# 0.0425775726 -5.91892342e-17
# 0.066458608 -1.12839074e-17
# 0.0640241671 -6.14347135e-17
# 0.0137324788 -1.89210766e-16
# -0.0795781115 -4.8677231e-17
# -0.170854483 5.57256364e-17
# -0.195699108 9.36852846e-17
# -0.116984632 8.4356964e-17
# 0.035702454 -1.0915202e-16
# 0.184907295 -5.08411347e-16
# 0.253684722 -8.22220121e-17
# 0.208657048 1.61332577e-16
# 0.0848730769 3.90401594e-17
# -0.0412576507 1.00315716e-16
# -0.108582674 -7.26022431e-17
# -0.107056602 -2.63098793e-16
# -0.0666701878 -6.44456573e-17
# -0.0158209918 -4.73265842e-17
# 0.0281874666 -1.50495428e-16
# 0.049954566 -7.87274911e-17
# 0.0523270956 3.87165222e-18
# 0.0525380063 7.36020313e-17
# 0.0528959143 -3.99178333e-17
# 0.0453191338 -3.45965777e-16
# 0.0330344072 -2.24126509e-16
# 0.0228428894 3.67996337e-18
# 0.0134555569 1.51282654e-16
# 0.00548878417 2.48801528e-16
# -0.00257031981 4.14760655e-16
# -0.0265364003 2.16837957e-16
# -0.0754731872 1.5553492e-17
# END