DOSY Experiments - Emory University

prg_flg 'y' selects purging pulse (default) 'n' omits purging pulse
prgtime purging pulse length (~0.002 s), used if prg_flg='y'
prgpwr purging pulse power, used if prg_flg='y'
wet flag for optional wet solvent suppression
satmode
flag for optional solvent presaturation
'ynn' - does presat during satdly
'yyn' - does presat during satdly and the diffusion delay
satdly presaturation delay before the sequence (part of d1)
satpwr saturation power level
satfrq saturation frequency
sspul flag for a GRD-90-GRD homospoil block
gzlvlhs gradient level for sspul
hsgt gradient duration for sspul
probe_ stores the probe name usedto acquire the dosy experiment
Processing Parameters:
determines the number of components to be used in fitting the
ncomp
signal decay in DOSY when dosyproc='discrete'.
nugflag
nugcal_[1-5]
dosyproc
dosybypoints
'n' uses simple mono- or multi-exponential fitting to estimate
diffusion coefficients
'y' uses a modified Stejskal-Tanner equation in which the exponent
is replaced by a power series.
a 5-membered parameter array summarizing the results of the
calibration of non-uniform field gradients. Used if nugflag='y',
requires a preliminary NUG-calibration by the Doneshot_nugmap
sequence. The values are taken from the probe file at the time of
the data acquisition
'discrete' - invokes monoexponential fitting with dosyfit if ncomp=1,
and multiexponential fitting with the external programme SPLMOD
if ncomp>1.
'continuous' invokes processing with the external programme
CONTIN and gives a continuous distribution in the diffusion
domain.
'n' divides the spectrum into individual peaks, creating one crosspeak
for each individual peak found in the 1D spectrum
'y' performs a diffusion fit for every point in the displayed region of
the spectrum that lies above the selected threshold
40