Bulletin of the American Physical Society
69th Annual Gaseous Electronics Conference
Volume 61, Number 9
Monday–Friday, October 10–14, 2016; Bochum, Germany
Session SR1: Electron-Molecule Collision Data for Plasma ModellingFocus
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Chair: Alisher Kadyrov, Curtin University Room: 1 |
Thursday, October 13, 2016 2:00PM - 2:30PM |
SR1.00001: Recent results for electron scattering from biomolecules and molecules formed due to plasma treatment of biomass Invited Speaker: Michael Brunger We have been concentrating our recent experimental studies, for determining absolute cross sections, on both biomolecules (e.g. pyrimidine and benzoquinone) and molecules that result when biomass undergoes treatment by plasmas (e.g. phenol and furfural). All this work was supported and informed by computations from the Brazilian SMC groups and the Madrid IAM-SCAR group. A major rationale for these investigations was to provide cross section data for relevant modelling studies, and in this talk I will also present some results from those modelling studies. Possible further investigations will be canvassed in this presentation. Work done in conjunction with: D. B. Jones, L. Campbell, R. D. White, S. J. Buckman, M. A. P. Lima, M. C. A. Lopes, M. H. F. Bettega, M. T. do N. Varella, R. F. da Costa, G. Garc\'{\i}a, P. Lim\~{a}o-Vieira, D. H. Madison, O. Ing\'{o}lfsson and many other friends and colleagues. [Preview Abstract] |
Thursday, October 13, 2016 2:30PM - 3:00PM |
SR1.00002: R-matrix calculations of electron molecule collision data for plasma models Invited Speaker: Jonathan Tennyson Models of low-pressure plasma require electron collision cross sections for many processes. For transient molecular species, almost none of these data are available from laboratory measurements so theory has to be the chosen means of providing the necessary information. The R-matrix method is a well-established fully quantal procedure for computing low-energy electron-collision cross sections. The R-matrix calculations using the UK Molecular R-matrix codes (UKRMol)[1], which are run by the Quantemol-N expert system, are being employed to provide a wide range of collision cross sections. These are augmented by use of suitable high-energy approximations, such as BEB for ionisation, and a novel procedure to give branching ratios for the fragmentation pattern following electron impact ionisation and electron impact dissociation. Examples, such as recently generated complete cross section sets for the molecules NF, NFand NF [2], will be given at the meeting. [1] J.M. Carr et al, (2016) Euro J. Phys. D, , 58. [2] J.R. \textsc{HAMILTON, J. TENNYSON, S.HUANG AND M.J. KUSHNER (2016) IN PREPARATION FOR SUBMISSION TO PLASMA SCI.~SOURCES TECH.} [Preview Abstract] |
Thursday, October 13, 2016 3:00PM - 3:15PM |
SR1.00003: Electron transport in furfural: dependence of the electron ranges on the cross sections and the energy loss distribution functions L. Ellis-Gibbings, K. Krupa, R. Colmenares, F. Blanco, A. Mu\'noz, M. Mendes, F. Ferreira da Silva, P. Lim\'a Vieira, D. B. Jones, M. J. Brunger, G. Garc\'ia Recent theoretical and experimental studies have provided a complete set of differential and integral electron scattering cross section data from furfural over a broad energy range$^{\mathrm{1,\thinspace 2}}$. The energy loss distribution functions have been determined in this study by averaging electron energy loss spectra for different incident energies and scattering angles. All these data have been used as input parameters for an event by event Monte Carlo simulation procedure to obtain the electron energy deposition patterns and electron ranges in liquid furfural. The dependence of these results on the input cross sections is then analysed to determine the uncertainty of the simulated values.\newline 1D. B. Jones, R. F. da Costa, M. T. do N. Varella, M. H. F. Bettega, M. A. P. Lima, F. Blanco, G. García,and M. J. Brunger, J. Chem. Phys. 144, 144303 (2016).\\ 2R. F. da Costa, M. T. do N. Varella, M. H. F. Bettega, R. F. C. Neves, M. C. A. Lopes, F. Blanco, G. García, D. B. Jones, M. J. Brunger, and M. A. P. Lima, J. Chem. Phys 144, 124310 (2016). [Preview Abstract] |
Thursday, October 13, 2016 3:15PM - 3:30PM |
SR1.00004: Plasma recombination in hydrocarbons and hydrocarbon:oxygen mixtures after high-voltage nanosecond discharge Eugene Anokhin, Maxim Popov, Igor Kochetov, Andrey Starikovskiy, Nikolay Aleksandrov The results of the experimental and numerical study of high-voltage nanosecond discharge afterglow in pure ethane, propane and hydrocarbon:oxygen mixtures are presented for room temperature and pressures from 2 to 20 Torr. Time-resolved electron density during the plasma decay was measured with a microwave interferometer for initial electron densities in the range between 5×10$^{\mathrm{10}}$ and 3×10$^{\mathrm{12}}$ cm$^{\mathrm{-3\thinspace }}$and the effective recombination coefficients were obtained. Measured effective recombination coefficients increased with gas pressure and were much higher than the recombination coefficients for simple molecular hydrocarbon ions. Synergistic effect was observed in hydrocarbon:oxygen mixtures when the recombination rates in the mixtures were higher than those in pure hydrocarbon and in pure oxygen. Calculations showed that electrons had time to thermalize prior to the recombination in hydrocarbon-containing plasma. The measured data were interpreted under the assumption that cluster hydrocarbon ions are formed during the plasma decay that is controlled by the dissociative electron recombination with these ions at electron room temperature. [Preview Abstract] |
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