A comparative study of carbon plasma emission in methane and argon atmospheres. Yousfi, H., Abdelli-Messaci, S., Ouamerali, O., & Dekhira, A. Spectrochimica Acta - Part B Atomic Spectroscopy, 142(2017):97-107, Elsevier B.V, 2018.
A comparative study of carbon plasma emission in methane and argon atmospheres [link]Website  abstract   bibtex   
The interaction between laser produced plasma (LPP) and an ambient gas is largely investigated by Optical Emission Spectroscopy (OES). The analysis of carbon plasma produced by an excimer KrF laser was performed under controlled atmospheres of methane and argon. For each ambient gas, the features of produced species have been highlighted. Using the time of flight (TOF) analysis, we have observed that the C and C2exhibit a triple and a double peaks respectively in argon atmosphere in contrast to the methane atmosphere. The evolution of the first peaks of C and C2follows the plasma expansion, whereas the second peaks move backward, undergoing reflected shocks. It was found that the translational temperature, obtained by Shifted Maxwell Boltzmann distribution function is strongly affected by the nature of ambient gas. The dissociation of CH4by electronic impact presents the principal approach for explaining the emission of CH radical in reactive plasma. Some chemical reactions have been proposed in order to explain the formation process of molecular species.
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 title = {A comparative study of carbon plasma emission in methane and argon atmospheres},
 type = {article},
 year = {2018},
 identifiers = {[object Object]},
 keywords = {Laser ablation,Laser-induced carbon plasma,Optical emission spectroscopy,Shifted Maxwell Boltzmann distribution function},
 pages = {97-107},
 volume = {142},
 websites = {https://doi.org/10.1016/j.sab.2018.02.006},
 publisher = {Elsevier B.V},
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 abstract = {The interaction between laser produced plasma (LPP) and an ambient gas is largely investigated by Optical Emission Spectroscopy (OES). The analysis of carbon plasma produced by an excimer KrF laser was performed under controlled atmospheres of methane and argon. For each ambient gas, the features of produced species have been highlighted. Using the time of flight (TOF) analysis, we have observed that the C and C2exhibit a triple and a double peaks respectively in argon atmosphere in contrast to the methane atmosphere. The evolution of the first peaks of C and C2follows the plasma expansion, whereas the second peaks move backward, undergoing reflected shocks. It was found that the translational temperature, obtained by Shifted Maxwell Boltzmann distribution function is strongly affected by the nature of ambient gas. The dissociation of CH4by electronic impact presents the principal approach for explaining the emission of CH radical in reactive plasma. Some chemical reactions have been proposed in order to explain the formation process of molecular species.},
 bibtype = {article},
 author = {Yousfi, H. and Abdelli-Messaci, S. and Ouamerali, O. and Dekhira, A.},
 journal = {Spectrochimica Acta - Part B Atomic Spectroscopy},
 number = {2017}
}
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