Just to add to what David said: the intensity of lines in a multiple is so
much more diagnostic than the number of lines.
In a quintet the ratio is 1:4:6:4:1, that's 2:3 for the lines in the center
and 1:4 for the outher lines. In a septet it's 1:6:15:20:15:6:1, or 3:4 for
the inner lines and 2:5 for the outer lines. That's a big difference.
Thomas
________________________________
> From: main_at_ammrl.groups.io on behalf of David Rovnyak via groups.io
> Sent: Tuesday, May 14, 2024 6:58:29 AM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] Assistance Needed: 29Si Experiment Issues #Bruker
On Tue, May 14, 2024 at 8:13 AM Craig Grimmer via groups.io wrote:
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<mailto:adil.raees_at_lums.edu.pk>
--
---------------------------------------------------------------------------
David Rovnyak, Professor of Chemistry, Bucknell Univ., Lewisburg, PA 17837
Twitter : NMR_Guy http://twitter.com/NMR_Guy
Research: http://www.facstaff.bucknell.edu/drovnyak/
Bucknell Chemistry: http://www.departments.bucknell.edu/chemistry/
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Received on Tue May 14 2024 - 06:49:07 MST