;zgsel1.fa
;1D sequence for calibration of semi-selective 1H 90 dgr. flip-down pulse
;Bruker Avance/Xwin-nmr version.
;
; semi-selective-90(x) - non-selective-90(-x) - acquire
;
;Written up by F. Abildgaard, NMRFAM (abild@nmrfam.wisc.edu)
;
; $Id: zgsel1.fa,v 1.2 2006/09/22 19:51:07 abild Exp abild $
;
;  Disclaimer: This pulse program is provided "as is" for your
;  information. Support for the use of this pulse program is only
;  provided to users of the National Magnetic Resonance Facility
;  at Madison (NMRFAM). Users of this pulse program employ it at
;  their own risk. Neither NMRFAM nor University of Wisconsin-Madison
;  are liable for any physical or other damage incurred during the
;  use of this pulse program.
;
; 
;f1: 1H
;o1p: on-resonance for H2O
;
;d1: relaxation delay, 2-3 s
;p1 90 H1 at pl1
;p11: 90 H1 semi-selective H2O pulse at power pl11.
;phcor21: relative phase of p11
;
;  How to use this sequence to calibrate a semi-selective 90 dgr. pulse
;  for the H2O resonance (flip-down):
;
;  1) Set phcor21 to 0 and pl11 to the desired length of the semi-selective
;     90 dgr. pulse (usually 2 ms). Set pl11 to 120 dB for now.
;     Set pl1 to the (calibrated) power level for the 1H 90 dgr.
;     non-selective pulse. 
;
;  2) Run a 1D 1H spectrum with rg = 1, ns = 1, ds = 0, and p1 to 2 us.
;     FT and phase the water resonance (positive signal).
;
;  3) Change p1 back to the length of the non-selective 90 dgr.
;
;  4) Estimate the power level sp2. This can be done using the pw and pl
;     for a regular 90 dgr. 1H pulse. If the proton 90 dgr. pulse is p1 at pl1,
;     pl11 = pl1 + 20*log10(p11/p1). This works best if CORTAB has been
;     performed on your instrument.
;
;  5) Optimize pl11:
;     run parnull (or paropt) varying pl11 in a +-3 dB window around the
;     value estimated in 4). Process using the same parameters (phase etc.)
;     as determined in 2). Look for the null. Then zoom in on the null
;     by running parnull (or paropt) again with 0.1 dB steps. If the phasing
;     is done correctly, a positive signal indicates that pl11 is too high,
;     a negative signal is a sign that pl11 is too low.
;     Be carefull not to miss the null by 6 dB: try varying pl11 from 60 dB
;     in -1 dB steps (20-30 steps) and look for the first zero-crossing. It
;     should be the same the one found above.
;
;  6) Optimize phcor21:
;     Set pl11 to the value determined in 5), with p11, p1 and pl1 all
;     set to their calibrated values. Using the same processing parameters
;     as in 5), run paropt varying phcor21 from -20 to +20 in 2 dgr steps.
;     Look for the value of phcor21 that minimizes the residual H2O signal.

;Define channel assignments:
#define H f1

;You shouldn't have to worry about anything beyond this point :-)

"d11=100m"
"d12=10u"
"d13=5u"


#include <Avance.incl>


1 ze
2 d11
3 4u
  d1 pl11:H
  (p11 ph21:r):H
  d13
  d12 pl1:H
  (p1 ph1):H
  go=2 ph31
  d11 wr #0
exit

ph21=0
ph1=2

ph31=0