Bulletin of the American Physical Society
64th Annual Gaseous Electronics Conference
Volume 56, Number 15
Monday–Friday, November 14–18, 2011; Salt Lake City, Utah
Session CT3: Environmental and Energy Applications |
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Chair: Igor Adamovich, Ohio State University Room: 255F |
Tuesday, November 15, 2011 8:00AM - 8:30AM |
CT3.00001: Effect of energetic electrons on combustion of premixed burner flame Invited Speaker: In many studies of plasma-assisted combustion, authors superpose discharges onto flames to control combustion reactions. This work is motivated by more fundamental point of view. The standpoint of this work is that flames themselves are already plasmas. We irradiated microwave power onto premixed burner flame with the intention of heating electrons in it. The microwave power was limited below the threshold for a discharge. We obtained the enhancement of burning velocity by the irradiation of the microwave power, which was understood by the shortening of the flame length. At the same time, we observed the increases in the optical emission intensities of OH and CH radicals. Despite the increases in the optical emission intensities, the optical emission spectra of OH and CH were not affected by the microwave irradiation, indicating that the enhancement of the burning velocity was not attributed to the increase in the gas temperature. On the other hand, we observed significant increase in the optical emission intensity of the second positive system of molecular nitrogen, which is a clear evidence for electron heating in the premixed burner flame. Therefore, it is considered that the enhancement of the burning velocity is obtained by nonequilibrium combustion chemistry which is driven by energetic electrons. By irradiating pulsed microwave power, we examined the time constants for the increases and decreases in the optical emission intensities of N$_2$, OH, CH, and continuum radiation. [Preview Abstract] |
Tuesday, November 15, 2011 8:30AM - 9:00AM |
CT3.00002: Differential cross-sections for elastic and inelastic electron scattering from fundamental polyatomic molecules Invited Speaker: The near-threshold scattering of electrons from polyatomic molecules of fundamental interest, e.g. water, primary alcohols and ring molecules e.g. furan, benzene are important in plasma fuel processes [1], plasmas used in biological processes e.g. in the treatment of skin diseases [2], astrophysical plasmas [3], etc. The determination of cross-sections for such molecules has gathered impetus because of the increasing number of applications industrial plasma and biomedical processes and the need to understand and model these complex processes. It is now possible to determine accurate differential cross-sections for electron scattering from these polyatomic molecules. We will present recent normalized, absolute low energy electron scattering differential cross-sections for near-threshold elastic and inelastic scattering from water, primary alcohols, furan and benzene using a well-tested electron spectrometer apparatus [4]. We will also compare our results with those of other experiments and available theoretical models, which show an encouragingly overall improved picture in terms of agreement between the different research groups. Funded by the National Science Foundation Research in an Undergraduate Institution Grant {\#}s 0653452 and 1135203. This work was done collaboratively with Drs. V. Mckoy and C. Winstead, Caltech, USA (National Science Foundation Grant {\#} 0653396 and Office of Basic Energy Sciences, US DOE Grant) and Dr. M. C. A. Lopes, U. Fed. de Juiz de Fora, Minas Gerais, Brazil; Dr. M. H. F. Bettega, U. Fed. do Parana, Curitiba, Brazil Drs. R. F. da Costa and M. A. P. Lima, Universidade Estadual de Campinas UNICAMP and CTBE, Campinas, Brazil (CNPq, FAPESP, FAPEMG, Finep, CENAPAD-SP and CAPES grants).\\[4pt] [1] S. M. Starikovskaia, J. Phys. D: Appl. Phys. \textbf{39} R265 (2006). \\[0pt] [2] M. Laroussi, IEEE Tanasactions on Plasma Science, \textbf{37}, 714 (2009). \\[0pt] [3] N. R. Badnell, 7th International Conference on Atomic and Molecular Data and Their Applications, Vilnius, Lithuania, 2010, IOP Publishing, Conference Proceedings,\textbf{1344} 139 (2011). \\[0pt] [4] M. A. Khakoo, C. E. Beckmann, S. Trajmar, and G. Csanak, J. Phys. B \textbf{27}, 3159 (1994). \\[0pt] [5] E.g.: C. Winstead and V. McKoy, J. Chem. Phys. \textbf{125}, 074302 (2006), R. F. da Costa, M. H. F. Bettega, and M. A. P. Lima, Phys. Rev. A \textbf{77}, 012717 (2008) and T. J. Gil, T. N. Rescigno and C. W. McCurdy and B. H. Lengsfield III, Phys. Rev. A 49 2642 (1994). [Preview Abstract] |
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