# al-zfilter-5Q-amplitude-selective-filtering-p2c.in

# approach: filtering the desired coherences (-5Q and +5Q) after the first pulse
#           and (0Q) after the second pulse

# spin-5/2 echo and antiecho amplitude optimization
# versus the second-pulse duration
# in three-pulse z-filtered amplitude-modulated 5Q-MAS sequence,
# the first-pulse duration p1 = 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               17
  crystal_file     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   40*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      4 
  variable p3      2 
}

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

  matrix set 1 coherence {-5 5}
  matrix set 2 coherence {0}

  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
# -0.000238278578 4.96107391e-07
# -0.00684389028 1.44844986e-05
# -0.043546333 9.49825002e-05
# -0.144060992 0.000328409047
# -0.324541282 0.000783042785
# -0.562353093 0.0014494527
# -0.80073206 0.00221535078
# -0.975801508 0.00289883016
# -1.04658883 0.00332771531
# -1.0106681 0.00341844768
# -0.900506673 0.00320753606
# -0.765789978 0.00282265077
# -0.650538596 0.00241538949
# -0.574365327 0.00209081
# -0.52656836 0.00186506952
# -0.476373601 0.0016703603
# END