Hello,
in ssNMR, a good suppression of background signals can often be
accomplished with Hahn echoes since the background has different 90 degree
times for a given power.
Happy resonating,
Ulli
On Sun, May 10, 2026 at 10:18 AM David Rovnyak via groups.io wrote:
> Signals of interest often lie in this regime so it has to be dealt with
> to see those clearly. Unless a special probe is constructed with lower
> background, this background can be quite large in typical probes. One
> option is that if your native signals are narrow, then a modest amount of
> back lp can get rid of most/all of this background without harming your
> native lines. -DSR
>
> On Sat, May 9, 2026 at 6:56 PM Eugenio Alvarado via groups.io wrote:
>
>> You can use backward linear prediction to get rid of it. It is likely
>> background from the probe.
>>
>> Eugenio Alvarado
>> Director, NMR Lab. Room 3500
>> Chemistry Department, University of Michigan
>> 930 N. University Ave., Ann Arbor, MI 48109-1055
>> Voice: (734)-764-9924
>>
>> On Sat, May 9, 2026, 5:37 PM Karel Klika via groups.io <karkli> utu.fi_at_groups.io> wrote:
>>
>>> Hi Puresh,
>>>
>>> This is just background from the probe, I get the same on my Prodigy (I
>>> checked it as it is different to my rt probe). So obviously you have tuned
>>> and matched and have a pulse with some power but there is no flourine in
>>> your sample.
>>>
>>> Sincerely,
>>> K. Klika
>>> ________________________________________
>>> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of pothula
>>> purushotham reddy via groups.io <purush.reddy2008=gmail.com_at_groups.io>
>>> Sent: 08 May 2026 23:59:10
>>> To: main_at_ammrl.groups.io
>>> Subject: [AMMRL] 19F peaks issue
>>>
>>> Hi there,
>>>
>>> I am measuring ¹⁹F NMR on a Prodigy probe at 400 MHz, but the spectra
>>> look strange/weird. Does anyone know what might be causing this or how =
to
>>> fix it? Any suggestions would be greatly appreciated.
>>>
>>> Thank you!
>>>
>>>
>>> Best
>>> Purush
>>>
>>>
>
> --
>
>
>
--
Dr. Ulrike Werner-Zwanziger
Adjunct Professor
Department of Chemistry, NMR-3,
Dalhousie University
6245 Castine Way
PO BOX 15000
Halifax, NS B3H 4R2
e-mail: Ulli.Zwanziger_at_Dal.ca
Tel. 1 902 494 8085
FAX: 1 902 494 1310
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Received on Sun May 10 2026 - 06:48:22 MST