Date: Tue, 14 May 2024 08:58:29 -0400
cheers: this has been solved and I have nothing new to add, but since this
is a nice spectrum and case study, just pasting a quick overlay of ideal
septet with the data that helps to show that you likely have the outer
peaks weakly, but you want to retake with more scans; the outer peaks of
septets are often tough to detect. -DSR
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
>>
>>
>
>
--
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David Rovnyak, Professor of Chemistry, Bucknell Univ., Lewisburg, PA 17837
Twitter : NMR_Guy http://twitter.com/NMR_Guy
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Bucknell Chemistry: http://www.departments.bucknell.edu/chemistry/
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(image/png attachment: 29Si.png)
(image/png attachment: 29Si_2.png)
(image/png attachment: image.png)