Abstract
We investigated changes in emission spectra from nitrogen/argon diluted laminar diffusion acetylene and ethylene blue flames irradiated by a powerful cw infrared CO2 laser. The changes in the radical emission bands can be interpreted as an indication of laser-induced decomposition of ethylene (for laser absorbing C2H4 fuel) and of laser-absorbing intermediates (for non-absorbing C2H2 fuel). The results indicate that released active hydrogen plays an important role in addition/abstraction reactions without any participation of oxygen.
Highlights
Interest in the spectroscopy of elementary hydrocarbon flames has been periodically fuelled by various applications
The reddening of the visible light coming from distant stars and the famous 220-nm hump in light absorption can be explained by interstellar carbon dust and interstellar molecules
Discovery of C60 and C70 molecules in interstellar clouds,[5] observation of some of the Diffuse Interstellar Bands (DIBs)’ features in acetylene plasmas,[6,7] in diacetylene molecule plasmas,[8] in CH2CN molecule plasmas,[9,10] etc., all bring investigators more confidence that the puzzle with carbon in the universe is connected with the transformation of elementary hydrocarbons, which are abundant in space, into some DIB-active organic molecules
Summary
Interest in the spectroscopy of elementary hydrocarbon flames has been periodically fuelled by various applications. Nitrogen/argon diluted acetylene and ethylene blue flames under infrared CO2 laser irradiation
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