These are not spinning sidebands — they are ^13C satellites (about 125 Hz
apart). They appear with opposite phase, which is a phase-related artifact.
The spectrum was acquired with only one scan, so there was no averaging,
and the incorrect TD0 setting (set to 1) means the digital filter group delay
was not properly corrected. This introduces a frequency-dependent phase error,
so the satellites show up with opposite sign. With the correct TD0 value or
proper reprocessing (first-order phasing), the satellites would appear normal.
iv
________________________________
> From: main_at_ammrl.groups.io on behalf of brcherry via groups.io
> Sent: Wednesday, October 1, 2025 2:19 PM
> To: main_at_ammrl.groups.io
> Subject: [EXTERNAL] [AMMRL] Strange 1H spectrum to share. Care to guess the cause?
I just had the pleasure of tracking down the root cause of this beauty. Be=
fore I give the answer, thought this could be fun to share with the group a=
nd see what grizzled NMR expert can determine the source issue. parameter=
s listed to side. Locked on DMSO-d6, tuned via 'atma exact', Topshim. 1 sca=
n, zg30.
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Received on Wed Oct 01 2025 - 17:53:23 MST