Hi Ken
I see that you have a very narrow signal in the center.
Is there any reason to scan all the way to zero field unless you expect a
signal in that region such as super broad EPR signals of transition metals.
The field tends to be unstable at such a low field leading to all kinds of
artifacts.
You could allow *field settling after fly-back* (setting delay of about 10
seconds at the end of a scan prior to scanning again somewhere in the
software, I don't know if this makes any sense )
It could be helpful to make sure that you are scanning very slowly (at
least 1G/s). Adjust the sweep width and the conversion time such that you
have a scan rate of 1G/s.
It could be helpful to scan the empty resonator and see if it is still
there?
Thanks
On Tue, Jun 13, 2023 at 2:23 PM Kenneth Sharp-Knott <kknott_at_vt.edu>=
wrote:
> Can't say I've ever seen an EPR post on here, but here goes... I'm barely
> familiar with EPR but manage the instrument in our lab. Today, the users
> are observing a signal/feature/hump an the start of the spectra from 0-500G
> which should not be there. I have no idea where it is coming from, but
> it's present in all samples, including the standard.
>
> Anyone have any ideas? This is a Bruker EMXplus with the Premium X MW
> bridge.
>
>
>
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