If the shim is good enough, you could try the 'noesypr1d' experiment. This
works reasonably well on my 80MHz without gradients.
Alex
[The Ohio State University]
Dr Alexandar L Hansen <
https://osu.academia.edu/AlexandarHansen>
Lead Research Scientist
CCIC & Gateway NMR Facility
R381 CBEC, 151 W Woodruff Ave, Columbus, OH 43210
614.292.7133 Office / 716.341.8476 Mobile
hansen.434_at_osu.edu ccic.ohio-state.edu
Pronouns: he/him/his
“Who's ready to make some science?” – Cave Johnson
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of DrSpin <rajanp_at_uw.edu>
> Sent: Friday, February 16, 2024 2:06 PM
> To: ammrl_at_groups.io <ammrl_at_groups.io>
> Subject: [AMMRL] Homospoil gradient question...might be a bit obscure !
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 Washington Seattle, WA 98195 phone : 206 685 2581
fax: 206 685 8665 email: rajanp_at_uw.edu
_____________________________________
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Received on Fri Feb 16 2024 - 11:33:42 MST