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Simulation fits better at lower g-values
Posted: Tue Feb 07, 2023 2:43 pm
by MariaM
I collected data for an irradiated suspension of struvite in aqueous DMPO solution and found that it generates OH, OOH, H, and singlet oxygen. I was able to fit it by using a linear combination of "garlic" simulations for the DMPO adducts of those 4 species. Overall, I am satisfied with my fit. However, I noticed that the simulation features line up slightly better at lower g-values than higher g-values. I was wondering if there was an explanation for this. If I shifted the g-value the central feature would no longer line up.
Re: Simulation fits better at lower g-values
Posted: Mon Feb 20, 2023 4:20 am
by DanielKlose
Dear Maria,
Did you consider any means for removing the magnetic field offset? E.g. by also measuring the cw EPR spectrum of a reference sample of known g-value such as DPPH. Otherwise the magnetic field offset will appear as a "g offset" in the simulation.
Since electro magnets have a soft iron core, it is normal that they produce an offset. We usually correct for that using a DPPH spectrum from the same measurement session.
Best wishes!
Re: Simulation fits better at lower g-values
Posted: Mon Feb 20, 2023 2:25 pm
by MariaM
How do I remove the g offset? I corrected for the offset from the literature g-value using DMPO-OH, but it sounds like that wasn't enough. Is it normal for the offset to be more prominent on one side of the spectrum?