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THE BAYES ANALYZE PARAMS FILE
175
0
1
2
3
4
5
1234567890123456789012345678901234567890123456789012
01 10 Global Model Parameters
02
03
Center Phase
=
219.17041042
04
Time Delay
=
0.00830983
05
Shim Delta
= 36.923702254267 2.5000000000000
06
R Minus 3 = 0.0121083700262
07
R Minus 2 = 0.0123818187190
08
R Minus 1 = 0.2878006370120
09
R Center = 0.2881405188680
10
R Plus 1 = 0.1340506287029
11
R Plus 2 = 0.1334510175742
12
R Plus 3 = 0.1320670090977
Figure 8.5: The global parameter immediately follow the header. There are at most 10 global
parameters. Here we have exhibited all 10 of these. These parameters include the two phasing
parameters, the spacing of the Lorentzian’s in the shimming model (Shim Delta), and the relative
amplitudes of the Lorentzian’s in the expansion.
in the shimming model expansion of the lineshape. It is the exact analogue of the J-coupling
constants in multiplets. There are two entries present on line 05: its current value and its
initial value. Its initial value is set to “lb”/(expansion order).
Lines 06 through 12 are the relative amplitudes assigned to the Lorentzian’s that make up the
lineshape expansion. If the shimming order is set to three, then there are three Lorentzian’s
for each peak in the spectrum. The total area under these peaks is required to add up to
one, so there are only two independent amplitudes; the third is redundant. By convention
we take the redundant amplitude to be the center amplitude. In Fig. 8.5 there are 7 relative
amplitudes shown, i.e., a seventh order expansion of the lineshape is being done. Each relative
amplitude is labeled “R” plus or minus something. For a seventh order expansion the largest
relative amplitude is the center relative amplitude, Line 04. Line 06 is labeled “R Minus 3” and
this means the third and smallest relative amplitude whose frequency is given by ω − 3δshim
where ω is the resonance frequency. Similarly, “R Plus 2” means the relative amplitude of the
shimming frequency given by ω + 2δshim .
8.5.1.3
The Model Components
The parameter file consists of the header, the global parameters, and then the individual resonance
models. Figure 8.6 is an example containing some constant models as well as a resonance model. In
this example there are three model components. Each model component consists of a blank line, a
comment line used as a header, here is a description of these lines:
Line 01 is the comment line for the first model.
Line 02 is the description of the model. In this case the model is a real constant model and constant
models do not have parameters, so there is nothing else on this line except the model number
and the model name.