Date: Fri, 16 Feb 2024 11:06:52 -0800
Dear Spinners
In the outset, due apologies if I am transmitting a silly question through
this venerable platform and taking up your time. As this is the last water
hole in the Savannah to turn to when it comes to our trade, I am nevertheless
hazarding this query.
I have an old system i.e. AV-I operating at 200 MHz (old by today's
standards, surely) coupled with an older probehead that doesn't have a
gradient coil. This is a busily used instrument in the teaching lab,
initiating the young undergrad Padawans to the wonders of magnetic
resonance and show them the way to become Jedi Knights (gulp !).
*The problem: *What I need to solve is to suppress the rather large water
peak in one type of samples with anything other than the presat technique.
As a benchmark, I used Bruker stock pulse program "zggpjrse" and it gives
beautiful results in a system with gradients.
I modified this program "zggpjrse" i.e. by removing the gradients, and I
get results with limited success.
Since the gradients seem to play such a crucial role, I wanted to explore
any possible options. I have noticed this SMB connector in the SCB boards
of this vintage that is marked as 'homospoil start'.
*Question: * Do any of you know/recall the way we can use an input trigger
to the SCB to initiate a spoil gradient from within the pulse program and
use this as the poor person's way of generating a large enough Z-gradient
using the shim stack, which should be adequate in a simple 1D
implementation like the one I am envisaging ?
If I am not mistaken, old timers in the group probably played with the
homospoil feature to tame solvent peaks like this before probes with
gradient coils became a given.
thank your for your valuable time.
Best
Rajan
--
____________________________________
Rajan K Paranji, Ph.D.NMR Services Manager
*Department of Chemistry**Room 65, Bagley Hall*
University of WashingtonSeattle, WA 98195
phone : 206 685 2581 fax: 206 685 8665email: rajanp_at_uw.edu
____________________________________________________________________
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