On analysis of my samples I got ESR peaks at 328 millitesla. What I can conclude from this ? What are the things I could understand by looking at an ESR spectrum?What are analysis I can do in this spectrum ?
I got only one peak at 328 mT. The literature too shows peaks in these region.Then what it depicts Dariya ?
My friend, I try to simply as :
328mT= 0.328T
So H [ or B]= 0.328T
Apply:
hν=gβ H
β =9.274.10^-24JT^-1[ Standard value]
g = hv/ βH
Now Check v from your experiment as to where ESR instrument gives this signal.
I suppose that v= 8.9 MHz= 8.9.10^9HZ.
With this supposition, calculate g as :
g = 6.627.10^-34Js.X.8.9.1o^9Hz/ 0.328T. 9.274.10^-24JT^-1
19.39.10^-25/ 10^-24= 1.939=1.94
Thanks a lot Manohar for making it so simple like school level ..lol..
Thanks a lot
Thanks ResearchGate too for helping me to connect to good researchers like Manohar and Dariya
I am measuring now polydopamine which belongs to the same family. First of all from a CW spectra you will gain 3 important values g factor ( close to 2.004-2.005), area under the curve proportional to number of spins in the sample and the line width a parameter which is related to spin relaxation but not only. That are basic things mentioned above and now case specific knowledge. Melamine possess 20-30% of water inside so decide if you want to measure it with water or without This decision will change the g factor probably, and the line width for sure. Outgassed polydopamine saturates very easily even in 70K, below that we have problems with measurement. it is mentioned in literature that the single line observed in experiment composes from at least two different radical types so you observe a sum of them. Your measured g factor won't be related to any of the radical types. Line deconvolution is questionable.
How I can do in-situ UV irradiation experiment in X Band EPR spectrometer ?
If you have UV laser (diode laser will work) than You can light the sample from the top to the inside of the EPR tube. In other case You need a resonator that has access from the front. The holes from front are bigger so You can use a lamp, but what fraction of this light will go inside the sample is unknown because of the reflective properties of the tube. On the other hand resonators are made especially for that, so it should work as well. If You want to do temperature measurements use an optical fiber and seal the entrance to the tube, with plasticine or silicone glue.
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