Hi Igor,
I'm not sure what you ask is possible--the tune arguments in topspin take
two numbers as arguments and those correspond to a certain set of shims.
The biggest set of shims you can tune as far as I know is Z-X-Y-XZ-YZ-Z.
There are probably multiple possibilities--one might be the old simplex routine.
Simplex tries to optimize shims by improving the lock level or the FID depending
on how you run it. Normally the lock level works fine. To run it, use
the command "xau simplex <tunefilename>" and put in a name of a tunefile.
The tunefiles are stored in <topspinhome>/exp/stan/nmr/lists/group and you can see
examples like tunezz2 that will let you optimize just a few shims, or tuneall that
goes through a whole bunch of them. Or you can access them with the command
edtune in topspin. You can edit a tunefile to have the list of shims that you
want to optimize and then save it and run simplex instead of topshim as your default
shimming routine. I would suggest giving it a shot and seeing how the results
look--if they're good enough for your needs, and also how slow it is. It's
not going to be fast, but if you don't try to shim EVERY SINGLE SHIM on every sample
it should work okay.
This will be slower than topshim, you can set it up in automation if you like, and
in general it's going to do a better job at giving you narrow lines than narrow
bases to your lines--if that makes sense. The lock is way more sensitive to
the overall linewidth than if the base looks nice. So you might limit the
highest order of shims you try to optimize with simplex--I wouldn't necessarily try
to optimize Z6 for example, and with the probe you have there's likely no need to anyway.
I suspect there will be somebody out there with a better idea but this is what comes
immediately to mind if you ain't got gradients and you want to do some sort of automatic
shimming.
Cheers,Mike
On Friday, February 28, 2025 at 08:57:15 AM MST, D'Anciaes Almeida Silva, Igor via groups.io wrote:
Hi all,
We'll need to use an older probe for some time while our regular one is with
Bruker for repairs. However, this old probe doesn't have gradient sotopshim
will not run. We want to run the tune-only option from topshim gui but,
in our files (it's TopSpin 3.2), we only have up totunea option. I checked the
.par file but couldn't figure it out.
Does anyone know how to write a .par file for higher order tune (like tuneaxyz3)?
Thanks,
----------------
Dr. Igor d'Anciães Almeida Silva
Research Scientist - NMR Core
University of Missouri-Columbia
32A Chemistry Building
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Received on Fri Feb 28 2025 - 08:15:46 MST