Hello,
As part of my master's thesis, we are gasifying biomass in an entrained flow reactor. We are collecting the light emitted by the flame via a collimating lens and an optical fibre in order to analyse the emission spectrum using a spectrometer. Our aim is to resolve emission peaks in the UV-VIS range as these peaks typically correspond to chemiluminescent emissions of excited radicals such as OH*, CH* or C2*. (See joined spectrum).
I was able to identify some of the transitions as these are quite well referenced in gas flame combustion literature (see table). However, there is close to no literature related to biomass gasification chemiluminescence (which appears to have different emission peaks when compared with typical gas flames).
Therefore, I would like to know if there are any collections referencing a large number of molecular state transitions and their chemiluminescent emission spectra in order for me to identify the remaining peaks. I have been trying to find such collection myself, but have not yet succeded.
Thanks in advance for your help.
Deare Theo Bernier,
Emitters originating from organic matter, in this case, can be formaldehyde and glyoxal. For some spectra, see the attached work.
Good luck!
Thank you very much for your answer. The continuum between 320 and 440nm could well be due to a superposition of the CO2* and formaldehyde chemiluminescence, but I haven't yet been able to find a molecule that is referenced to emit the highest peak in this figure (the one at 422.5nm). I've looked through the entire work by Huber and Herzberg "Molecular Spectra and Molecular Structure - Constants of Diatomic molecules". and the only transition that comes close is the BO A-->X transition depicted in the screenshot below.
Considering that we're gasifying biomass and that this peak is present with a high intensity in all our measurements, I highly doubt, that this BO transition is the one is the one we're looking for.
Do you have any ideas, or any hints on where I should be looking?
I haven't found anything in the NIST or the RIOS databases that corresponds and frankly I'm not sure on how to proceed to solve this puzzle.
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