CPMG pulse program with FADC digitizer for AVANCE AQX.
Contribution of Y. Millot




Home and Applets > Pulse Program > XwinNMR 2.6, ASX, MSL > CPMG with FADC Digitizer and Analog Filtering (AQX Spectrometer)
Carr-Purcell-Meiboom-Gill echo train

J. T. Cheng and P. D. Ellis ( J. Phys. Chem. 93, 2549-2555, 1989) studied the adsorption of Rb+ to γ-alumina using CPMG echo train pulse sequence. The Fourier transform of the fid followed by the train of m echoes is a spikelet spectrum. The latter has a better signal-to-noise ratio than that from one-pulse experiment.



Code for Avance AQX NMR spectrometers with xwinnmr 2.6 operating system

  ;Carr-Purcell-Meiboom-Gill echo train acquisition with analog filtering
  ;and FADC digitizer
  #include <Avance.incl>
  define delay dx
  define delay px
  "l2 = 2*l1"
  "l4 = l3*l2 + l1"
  "dx = dw/2"
  "px = dw/2"

          ze                         ; clear memory, new data replace old data.
  start,  d1 pl1:f1                  ; recycle duration.
          p1:f1     ph1          ; 90 pulse with x phase.
          d11                        ; echo delay d11 + d14.
          d14                        ; echo delay d11 + d14.
          p2:f1     ph2          ; 180 refocussing pulse with y phase.
          d11 adc   ph31             ; echo delay d11 + d14.
          d14:e     ph0    syrec     ; echo delay d11 + d14.
  fid,    dx                       ; dx + px, the dwell time for the external dwell-pulse.
          px:x                     ; external dwell-pulse for the fid data digitizing.
          lo to fid times l1       ; loop for the fid data digitizing.
  nbecho, d11:e            sytra     ; echo delay d11 + d14.
          d14:e                      ; echo delay d11 + d14.
          p2:f1:e   ph3          ; 180 refocussing pulse with y phase.
          d11:e            syrec     ; echo delay d11 + d14.
          d14:e     ph0              ; echo delay d11 + d14.
  echo,   dx                       ; dx + px, the dwell time for the external dwell-pulse.
          px:x                     ; external dwell-pulse for an echo data digitizing.
          lo to echo times l2      ; loop for an echo data digitizing.
          0.1u
          lo to nbecho times l3  ; loop for the echo train acquisition.
          rcyc=start             ; loop to start, ns times for averaging.
          100m wr #0             ; delay for disk I/O, store signal.
  ;-------------------------------------
  tmp,    100u
          lo to tmp times l4     ; provide the time-domain size td = l4.
  ;-------------------------------------
  exit                           ; end of the pulse program.

  ph1  = 0 0 1 1 2 2 3 3                   ; f1 channel p1 pulse phase
  ph2  = 1 3 2 0 3 1 0 2                   ; f1 channel first p2 pulse phase
  ph3  = 1 3 2 0 3 1 0 2  3 1 0 2 1 3 2 0  ; f1 channel second p2 pulse phase
  ph31 = 0 0 1 1 2 2 3 3                   ; receiver phase
  ph0  = 0                                 ; receiver reference phase

  ;pl1:   f1 channel power level for p1 and p2 pulses
  ;d11:   10u
  ;l1:    number of digitized points for the fid
  ;l2:    number of digitized points for an echo
  ;l3:    number of echoes
  ;ns = 16*n
  ;dw = dx + px, dwell-time for the external dwell-pulse
  ;aq = dw*td
  

(top)

[Contact me] - Last updated December 16, 2012
Solid-state NMR bibliography for
Aluminum-27
Antimony-121/123
Arsenic-75
Barium-135/137
Beryllium-9
Bismuth-209
Boron-11
Bromine-79/81
Calcium-43
Cesium-133
Chlorine-35/37
Chromium-53
Cobalt-59
Copper-63/65
Deuterium-2
Gallium-69/71
Germanium-73
Gold-197
Hafnium-177/179
Indium-113/115
Iodine-127
Iridium-191/193
Krypton-83
Lanthanum-139
Lithium-7
Magnesium-25
Manganese-55
Mercury-201
Molybdenum-95/97
Neon-21
Nickel-61
Niobium-93
Nitrogen-14
Osmium-189
Oxygen-17
Palladium-105
Potassium-39/41
Rhenium-185/187
Rubidium-85/87
Ruthenium-99/101
Scandium-45
Sodium-23
Strontium-87
Sulfur-33
Tantalum-181
Titanium-47/49
Vanadium-51
Xenon-131
Zinc-67
Zirconium-91



Copyright 2002- pascal-man.com. All rights reserved.