Date: Tue, 14 May 2024 13:52:18 +0200
Good afternoon Muhammad
On issue 2, try increasing the number of scans because it looks like there
is the beginning of the "missing" signals in your spectrum. As a rule of
thumb, 2 x S/N requires 4 x NS.
Kind regards,
Craig.
On Tue, 14 May 2024 at 10:50, Muhammad Adil Raees via groups.io wrote:
> Hello everyone,
>
> We recently conducted a 29Si experiment on our system and encountered two
> issues. We would appreciate your advice on these matters.
>
> Issue 1: I was able to tune and match the probe with ATMM as shown in the
> attached picture. I stored the values by clicking on the close and store
> values box. However, when I tried to perform ATMA, I was directed to
> optimize from ATMM again. A message box popped up on the screen, as
> attached in this email. I am wondering how to store the wobble curve so
> that ATMA can adjust it itself.
>
> Issue 2: The researcher expected a heptate from 29Si at around 188ppm, but
> I only detected a pentate. The signal is clear, but the outermost signals
> didn't appear. I am wondering what parameters I should focus on to improve
> the result. Do you think an inaccurate 90-degree pulse could be the cause?
>
>
> Kind regards,
>
> --
> Muhammad Adil Raees, Ph.D.
> Manager NMR Facility
> The Central Laboratory
> Syed Babar Ali School of Sciences and Engineering
> Lahore University of Management Sciences
> Opposite Sector-U, D.H.A. 54792, Lahore
> +92-330-2866755
> adil.raees_at_lums.edu.pk
>
>
>
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(image/png attachment: 29Si.png)
(image/png attachment: 29Si_2.png)