Restricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Franklin R.N 2001A comprehensive treatment of the positive column of discharges in electronegative gasesProc. R. Soc. Lond. A.457307–330http://doi.org/10.1098/rspa.2000.0668SectionRestricted accessResearch articleA comprehensive treatment of the positive column of discharges in electronegative gases R.N Franklin R.N Franklin Oxford Research Unit, The Open University, Foxcombe Hall, Boars Hill, Oxford OX1 5HR, UK Google Scholar Find this author on PubMed Search for more papers by this author R.N Franklin R.N Franklin Oxford Research Unit, The Open University, Foxcombe Hall, Boars Hill, Oxford OX1 5HR, UK Google Scholar Find this author on PubMed Search for more papers by this author Published:08 February 2001https://doi.org/10.1098/rspa.2000.0668AbstractFluid equations are used to describe the plasma which is the positive column of a gas discharge in electronegative gases. These equations are solved computationally over a wide range of the parameters needed to characterize the plasma when attachment, detachment, recombination, ionization and particle collisions are significant processes. Where possible, comparison is made with results obtained by the method of matched asymptotic approximations. The conditions under which discharges may exist are elucidated and it is shown that it is necessary to include ion diffusion, through the ion temperature, to get realistic distributions of the ions at higher pressures. The conditions under which such discharges are structured are obtained with the general requirement that the attachment rate must be less than the ionization rate for there to be a central ion‐ion plasma core. Equally, the nearly collisionless situation is described in detail in the fluid approximation. Previous ArticleNext Article VIEW FULL TEXT DOWNLOAD PDF FiguresRelatedReferencesDetailsCited by Coche P, Guerra V and Alves L (2016) Microwave air plasmas in capillaries at low pressure I. Self-consistent modeling, Journal of Physics D: Applied Physics, 10.1088/0022-3727/49/23/235207, 49:23, (235207), Online publication date: 15-Jun-2016. RICHTER A, TESTRICH H, WAGNER H, LOFFHAGEN D and WILKE C (2009) Dynamic behaviour of an oxygen dc discharge, Journal of Plasma Physics, 10.1017/S0022377808007502, 75:1, (71-84), Online publication date: 1-Feb-2009. Franklin R (2003) Electronegative plasmas diluted by rare gases, Journal of Physics D: Applied Physics, 10.1088/0022-3727/36/21/009, 36:21, (2655-2659), Online publication date: 7-Nov-2003. Franklin R (2003) Ambipolar diffusion is a misnomer, Journal of Physics D: Applied Physics, 10.1088/0022-3727/36/7/310, 36:7, (828-831), Online publication date: 7-Apr-2003. Franklin R (2002) Electronegative plasmas why are they so different?, Plasma Sources Science and Technology, 10.1088/0963-0252/11/3A/304, 11:3A, (A31-A37), Online publication date: 1-Aug-2002. Kono A (2002) Negative ions in processing plasmas and their effect on the plasma structure, Applied Surface Science, 10.1016/S0169-4332(02)00023-5, 192:1-4, (115-134), Online publication date: 1-May-2002. Franklin R (2001) A critique of models of electronegative plasmas, Plasma Sources Science and Technology, 10.1088/0963-0252/10/2/305, 10:2, (162-167), Online publication date: 1-May-2001. This Issue08 February 2001Volume 457Issue 2006 Article InformationDOI:https://doi.org/10.1098/rspa.2000.0668Published by:Royal SocietyPrint ISSN:1364-5021Online ISSN:1471-2946History: Published online08/02/2001Published in print08/02/2001 License: Citations and impact Keywordsrecombinationmatched asymptotic approximationsdetachmentelectronegative gasesplasmaion diffusion