# al-zfilter-amplitude-12p2p3-filtering-p1c.in

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

# spin-5/2 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 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 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 27Al: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# 6.59623563e-06 1.18598513e-09
# 0.000101984004 4.6113929e-07
# -4.25702572e-05 5.61131521e-06
# -0.00314689215 2.58753252e-05
# -0.0155622764 6.98696845e-05
# -0.0427187346 0.000133909106
# -0.0826962242 0.000208306902
# -0.128187328 0.000296906629
# -0.171607076 0.000417266209
# -0.207805126 0.000577213514
# -0.237477652 0.000764038067
# -0.264808958 0.000955054531
# -0.289873656 0.00112861447
# -0.307838937 0.001267535
# -0.314147827 0.00135699268
# -0.307817567 0.00138407614
# -0.291181164 0.0013448027
# -0.268467117 0.00125166485
# -0.244904996 0.00113237804
# -0.225376263 0.0010196724
# -0.213247194 0.000940790696
# -0.209752468 0.00091046964
# -0.213981851 0.000925443385
# -0.22531829 0.000966776722
# -0.243508002 0.0010100952
# -0.264221517 0.00103460834
# -0.279581756 0.0010297255
# -0.283541586 0.000993833137
# -0.273137427 0.000923676942
# -0.247317424 0.000812134682
# -0.206906924 0.000657975991
# -0.1540805 0.000470530683
# -0.0923126638 0.000264816227
# END