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Yes, that was the issue! Now the code is working! thank you!

Cheers,

Bryant

Thank you Dr Stoll! I have written the following code and confirmed that my custom simulation function returns the difference spectrum. When I run it the esfit user interface pops up with my data (contained in the variable diff_240) and it all seems normal. when I hit "Start" in the esfit ...

Hello, Is it possible to use the esfit fitting function in EasySpin to fit a difference epr spectrum? i generated a difference spectrum because subtracting two spectra shows a transition from one state to another and eliminates interference from overlapping signals that do not change. it should be t...

Thanks for the reply. if there is no masking functionality currently I could probably get away with simulating the 3/2 signal along with the 1/2. the issue I have though is that when I try to do that the spectrum looks like it has a whole bunch of artifacts. I am looking at the high field region (x ...

Hello, is it possible to use a masking function to get esfit to ignore a region of the spectrum during fitting. I am trying to fit a spectrum with an S=3/2 species and an S=1/2 species. I just want to fit the inflections corresponding to the s=1/2 feature and ignore an inflection in the region from ...