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 GT1: Plasma Data Exchange Project |
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Chair: Leanne Pitchford, LAPLACE and University of Toulouse Room: 255D |
Tuesday, November 15, 2011 7:00PM - 7:10PM |
GT1.00001: INTRODUCTION Leanne Pitchford |
Tuesday, November 15, 2011 7:10PM - 7:35PM |
GT1.00002: Computational Methods for Electron-Atom Collisions Invited Speaker: In recent years, much progress has been achieved in calculating reliable cross-section data for electron scattering from atoms and ions, in particular quasi-one and quasi-two electron systems such as H, He, the alkalis, and the alkaline-earth metals. Until recently, however, accurate calculations of electron collisions with more complex targets, such as the heavy noble gases Ne$-$Xe, have remained a significant challenge to theory. We will give an overview of the computational methods presently used for {\it ab initio} electron-atom collision calculations, with particular emphasis on their strengths and weaknesses, range of applicability, and expected accuracy. In particular, we will illustrate with a few examples how the $B$-spline $R$-matrix (BSR) method with non-orthogonal orbitals~[1-3] has been able to dramatically improve the quality of theoretical datasets for oscillator strengths~[4] and in particular for electron collisions with the heavy noble gases~[5]. \\[4pt] [1] O. Zatsarinny and K. Bartschat, J.~Phys. B~{\bf 37} (2004), 2173 and 4693.\\[0pt] [2] O. Zatsarinny, Comp. Phys. Commun. {\bf 174} (2006) 273.\\[0pt] [3] O. Zatsarinny and K. Bartschat, Phys. Rev. A {\bf 77} (2008) 062701.\\[0pt] [4] O. Zatsarinny and K. Bartschat, Phys. Scr. Rev. {\bf T134} (2009) 014020.\\[0pt] [5] K. Bartschat and O. Zatsarinny, Plasma Sources Sci. Technol. {\bf 20} (2011) 024012. [Preview Abstract] |
Tuesday, November 15, 2011 7:35PM - 8:00PM |
GT1.00003: Updated compilations of electron scattering from ground-state, noble gas atoms Invited Speaker: An updated analysis of the cross sections for electron scattering from ground state atoms for noble gases in the energy range from thermalto 10 MeV is outlined. The work was driven by the necessity tounderstand the Penning transfers and light emission in detectors of high energy particles and dark matter. The published experimental data for electron scattering up to 2010 have been used in the analysis. Recent, theoretically improved cross sections have been used in the important threshold region for both the singlet and triplet states. Experimental or theoretical oscillator strengths and BEF scaling have been used above the resonance region for the singlet states. The number of excitation levels considered (typically about 40) is chosen so that the sum of the oscillator strengths for the considered levels is within a few percent of the theoretical sum rule. The resulting total cross sections are within a few percent of the measured values, and the calculated Fano factors are consistent with available data. These data are now available on the LXCat website. [Preview Abstract] |
Tuesday, November 15, 2011 8:00PM - 8:25PM |
GT1.00004: ICEcat: An on-line database for ion-neutral potentials and the transport properties of ions in gases Larry Viehland In 2010, the database for gaseous ion transport coefficients that I had been maintaining for many years was developed into a web-based system by Sergey Pancheshnyi and other researchers at LAPLACE, the LAboratoire des PLasmas et Conversion d'Energie, a laboratory operated jointly by CNRS, the University of Toulouse and the Institut Polytechnique of Toulouse. The new system can be freely accessed at http://www.icecat.laplace.univ-tlse.fr/. This talk will give a brief history of the database before 2010, but the focus will be on developments within the last 18 months. The use of this database will be illustrated, in order to demonstrate the large number of data files already included and how graphical and tabular results can be obtained. Some future directions for improving the database will be indicated, and suggestions for improvement and new directions will be solicited from the audience. [Preview Abstract] |
Tuesday, November 15, 2011 8:25PM - 10:00PM |
GT1.00005: OPEN MICROPHONE Discussion topics will include--but are not limited to--a status report of the LXCat online database for electron transport, brief presentations (limited to one PowerPoint slide) of relevant contributions in other sessions of GEC 2011, general comments, organizational issues, and plans for the GEC 2012 workshop. [Preview Abstract] |
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