Hello,
I am confused with the emission wavelength of super oxide and hydrogen peroxide radical generated from atmospheric pressure plasma jet. I have found only few articles which discuss about its emission wavelength. For Super oxide, few articles mention 245 nm but I don't see at 245 nm (but emission occurs at 247 nm which is from NO \gamma) and few mention 517 nm. My plasma has 517 nm emission line. Is it from super oxide ?
Further, very few papers talk about the emission wavelength of hydrogen peroxide. One paper mentions 254 nm but it doesn't have satisfactory source. Few other talk about 590 nm but I am not clear.
Can any one help me with the suitable citation source ?
I would be grateful for your answer..............
Hi!
Molecular emission in the visible spectrum is a tricky thing. In particular, because molecular emission comes in bands and usually not in distinct lines. I would always check first the NIST database if there is no other strong atomic(!) emission line at 517 nm coming from an expected atomic species. Google for "NIST atomic emission " , and you will find the database.
BR,
Christoph
Dear Christoph,
Thank you for your reply.
According to NIST atomic database, there is a line at 517.5 nm from OII. Also, my spectrum has a line at 517.5 nm. This means this is from Oxygen and not from Super oxide !
NIST database provides information about emission lines from a particular single species. If I have to find emission wavelength for a particular reactive species i.e. OH radical (as mentioned in many papers at 309 nm and also observed in the spectrum), where can I find this ?
For OH, this might be useful: Eur. Phys. J. D 54, 77–86 (2009), DOI: 10.1140/epjd/e2009-00174-9
Other than that, if you have to calculate something more in-depth, here are some cross sections for OH A-X band generated from H2O cracking by e- impact: J. Phys. Chem. Ref. Data, Vol. 34, No. 1, 2005
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