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SPIG V 2000 #' свеске ФИЗИЧКИХ НЛУКЛ SFIN year XIV Series A: Conferences No. Al (2001) 20th SPXGl· THE PHYSICS OF IONIZED GASES INVITED LECTURES, TOPICAL INVITED LECTURES AND PROGRESS REPORTS Editors: N. Konjević, Ζ. Lj. Petrović, and G. Malović Institute of Physics Faculty of Physics, University of Belgrade Institute of Nuclear Sciencies "Vinča" Belgrade, Yugoslavia 20 Summer School and International Symposium on the Physics of Ionized Gases 20th SPIG September 4. - September 8. 2000, Zlatibor, Yugoslavia THE PHYSICS OF IONIZED GASES INVITED LECTURES, TOPICAL INVITED LECTURES AND PROGRESS REPORTS Dedicated to the memory of prof. Milan Kurepa Editors: N. Konjević, Ζ. Lj. Petrović and G. Malović Institute of Physics, Zemun, Yugoslavia Faculty of Physics, University of Belgrade, Belgrade, Yugoslavia Institute of Nuclear Sciences "Vinča", Belgrade, Yugoslavia скске ФИЗИЧКИХ mm SFIN year XIV Series A: Conferences No. Al (2001) THE PHYSICS OF IONIZED GASES Edited by N. Konjevic Z.Lj. Petrovic G. Malovic SPIG 2000 SFIN, XIV (Al), 1 -531, Belgrade 2001 Institute of Physics, Belgrade, Yugoslavia CBSCKe ФИЗИЧКИХ mm UDK 53 Series A: Conferences SFIN, year XIV, No.Al (2001) YU ISSN 0354-9291 Publisher Institute of Physics, Belgrade Diredor Editor-in-Chief Dragan Popovic Relja Popic Guest Editors Nikola Konjevic Zoran Lj. Petrovic Gordana Malovic Associate Editors Mirjana Popović-Božić Jovan Konstantinovic Editorial Board Ivan Aniiin Božidar Milic Ljliljana Dobrosavljević-Grujić Slobodan Stamenkovic Nikola Konjevic Miodrag Stojic Dragutin Lalovic Djordje Sijacki 1 Milan Kurepa | Advisory Board Radovan Antanasijevic Sava Milosevic Tasko Grozdanov Dragan Popovic Fedor Herbut Mirjana Popović-Božić Jovan Konstantinovic Marko Popović Jaroslav Labat Miloš Skorić Zvonko Marić, president Editorial Office SFIN Institute of Physics P.O.Box 57 Pregrevica 118, Zemun 11001 Belgrade, Yugoslavia Ministry of Science, Technology and Development of the Republic of Serbia supports the publication of this journal Copyright © 2001 by Institute of Physics, Belgrade, Yugoslavia All rights reserved This book, or parts thereof, may not be reproduced in any form or by any means, electronic or mechanical, including photocopying, recording or any information storage and retrieval system now known or to be invented, without written permission from the Publisher. The price for this issue is din. 800.00 (foreign $50.00). Students are qualified for reduced rates. Please place your orders and inquiries to "BF Club", P.O.Box 86, 11080 Zemun, Yugoslavia, fax + (381) 11 186-105. Printed by: Public Enterprise of PTT Traffic "Srbija" Publishing Department, Belgrade - Yugoslavia Number of copies: 220 20th SPIG SCIENTIFIC COMMITTEE N. Konjević, Chairman, Yu N. Bibic YU Κ. Lieb GER S. Buckman AUS τ. Makabe JPN M. Dimitrijevic YU Β. Marinkovic YU s. Đurović YU Ν. Nedeljkovic YU T. Grozdanov YU Ζ. Petrovic YU D. Jovanović YU Μ. Radovic YU M. Kono JPN Μ. Skoric YU ORGANIZING COMMITTEE Ζ. Petrović, Co-Chairman N. Bibić, Co-Chairman Μ. Kuraica, Co-Chairman G. Malović, Secretary Lj. Hadžijevski N. Kos Ν. Sišović Β. Marinković Μ. Radetić Α. Strinic Ζ. Raspopovic D. Maric Ν. Sakan CONTENTS Section 1. ATOMIC COLLISION PROCESSES INVITED LECTURES K. W. Trantham, R. J. Gulley>, H. Cho, R Panajotović, L J. Ulhmann, S. J. Buckman 3 NEW TECHNIQUES FOR ELECTRON COLLISIONS RESEARCH M. Ya. Amusiu MANY-ELECTRON CORRELATIONS IN PHOTON AND ELECTRON 19 INTERACTION WITH ATOMIC PARTICLES D. M. Filipović, Β. P. Marinković COMPLETING OF ELECTRON - ATOM SCATTERING PICTURE FOR ARGON AND THE RARE GASES 41 R. McCarroll RESONANT DOMINATED PHOTOD1SSOCIATION AND PHOTOIONIZATION 61 W. Lindinser (apstract only) TRACE CONSTITUENTS MEASURED ON - LINE BY PROTON - TRANSFER - REACTION MASS SPECTROMETRY (PTR-MS): APPLICATIONS IN MEDICAL, FOOD AND ENVIRONMENTAL RESEARCH 81 TOPICAL INVITED LECTURES R. Schuch, N. Eklow, P. Glans, E. Lindroth, S. Mandzunkov, M. Tokman ELECTRON - ION RECOMBINATION AT VERY LOW ENERGY нз S. J. Buckman, L. T. Chadderton and S. Cruz - Jimenez SYSTEMATIC REGULARITIES IN LOW ENERGY ELECTRON - MOLECULE SCATTERING 97 PROGRESS REPORTS D. D. Markusev INTRA AND INTERMOLECULAR VIBRATIONAL ENERGY TRANSFER IN DIFFERENT GAS MIXTURES 113 Z. M. Raspopovie TRANSPORT OF ELECTRONS IN CROSSED ELECTRIC AND MAGNETIC RF FIELDS 129 χ Section 2. PARTICLE AND LASER BEAM INTERACTION WITH SOLIDS INVITED LECTURES Z. D. Pešić, Gy. Vikor; J. Anton, R Schuch SCATTERING OF HIGHLY CHARGED IONS FROM SOLID SURFACES 147 R. Smith CLASSICAL MOLECULAR DYNAMICS CALCULATIONS FOR LOW ENERGY PARTICLE-SURFACE INTERACTIONS 173 P. Kovač, Μ. Pavlović, S. Stanček ANALYSIS OF MATERIALS BY ION BEAMS 193 Z. L. Mišković, F. Ο. Goodman, S. G. Davison, W. -K. Liu, Y. -N. Wang INTERACTION OF FAST CLUSTERS WITH SOLIDS 2/3 P. Oelhafen, A. Schuler, J. Geng, D. Mathys, R Guggenheim PLASMA ASSISTED DEPOSITION OF THIN FILMS AND IN-SITU CHARACTERIZATION WITH PHOTOELECTRON SPECTROSCOPY 233 PROGRESS REPORTS S. Petrovic THEORY OF RAINBOWS IN THIN CRYSTALS 249 Section 3. LOW TEMPERATURE PLASMAS INVITED LECTURES Z. Donko SELF-CONSISTENT HYBRID MODELING OF THE TRANSITION FROM THE TOWNSEND DISCHARGE TO THE ABNORMAL GLOW 267 V. I. Arkhipenko, L. V. Simonchik INVESTIGATIONS OF THE SELF-SUSTAINED GLOW DISCHARGE IN HELIUM AT ATMOSPHERIC PRESSURE 2H7 K. Wiesemann SPECTROSCOPIC INVESTIGATIONS OF DIELECTRIC BARRIER DISCHARGES 307 G. Popa MAGNETRON DISCHARGE AND HYSTERESIS EFFECT 327 L Vušković, S. Popović COLLISIONS OF EXCITED ATOMS IN GAS DISCHARGES 347 PROGRESS REPORTS /. Stefanović OSCILLATIONS AND CONSTRICTIONS OF THE LOW PRESSURE LOW CURRENT DISCHARGES 365 Section 4. GENERAL PLASMAS INVITED LECTURES Z Yoshida SHEAR FLOW PROBLEMS IN PLASMA PHYSICS 3*3 R. Horiuchi. W. Pei, T. Sato KINETIC THEORY OF COLLISIONLES S DRIVEN RECONNECTION 401 F. Pegoraro, D. Grasso, F. Califano, F. Porcelli NONLINEAR COLLISIONLESS MAGNETIC FIELD LINE RECONNECTION IN PLASMAS 415 M. S. Dimitrijevic STARK BROADENING IN ASTROPHYSICS 433 E. G. Mediavilla, S. Arribas 2D SPESTROSCOPIC STUDIES OF THE IONIZED GAS IN THE CENTRAL REGION OF GALAXIES 453 T. Yamanaka (apstract only) EXPERIMENTAL RESEARCH ON ULTRA-INTENSE LASER PLASMA INTERACTIONS AT ILE OSAKA 463 PROGRESS REPORTS D. Jevremovic BALMER LINES IN STELLAR FLARES 465 Section 5. HISTORY OF SPIG MEETINGS M. Kurepa, J. Labat HISTORY OF SPIG MEETINGS 4H3 AUTHOR INDEX 531 xii COMPLETING OF ELECTRON-ATOM SCATTERING PICTURE FOR ARGON AND THE RARE GASES D.M.Filipović* and B.P.Marinković+ *Faculty of Physics, University of Belgrade, PO Box 368,11001 Belgrade, Yugoslavia 4Institute of Physics, PO Box 57,11001 Belgrade, Yugoslavia Abstract. Electron-atom scattering picture is not complete, even for unpolarised incident electrons and argon, almost a century after the Lenard's pioneering works. Such criticism particularly has weight in the case of Ne, Kr, Xe and Rn. A great deal of effort was devoted to measure differential and integrated cross sections for both elastic and inelastic scattering of electrons by Ar and the rare gases, except Rn. Performances of apparata used in such kind of experiments are in permanent progress. Separation of inelastically scattered electrons from elastically scattered is the solved problem, even at the primary beam direction. But, the back-scattering is attained recently, by using a sophisticated technique. As jet, electron optics is of inferior resolution with respect to light optics; only lower excited states of argon and the rare gases are resolved in the electron energy-loss spectra. From the measurements we can obtain many information about processes that are not too complicated, like elastic scattering. It is easy to visualize such process and to estimate: (a) relative contribution of effects of long-range Coulomb and short-range exchange interactions to the cross sections, (b) position of critical points - where differential cross section attains its smallest values and (c) relative atomic diameter. For processes that are more complex, measurements were generally carried out only at a few impact energies. So, it is not easy to estimate the effects of: electron "absorption", statistical weight ratios of the fine structure states, scattering at small angles etc. A more thorough knowledge about a structure (rapid decrease) in the elastic integral cross sections for Ar and Xe at intermediate energies (10-100 eV) required a new approach and more precise measurements. 41 1. INTRODUCTION Nineteen seven years ago, Lenard1 published an experiment of electron - gas atom collisions with the aim to throw more light to both the constituents and the structure of matter. Results of that experiment with argon (and a few molecules) as a target, attracted a great interest, especially as a base for a model of the atom, well known at the present as the Lenard's model. A decade after, observation of a substantial energy absorption in inelastic electron-atom collisions, by Franck and Hertz2, was an elegant proof of Bohr's theory of the hydrogen atom. Both experiments pointed out lower incident electron velocities, at which the collision involves a number of complex processes, as more convenient to perform new fundamental experiments. It is thorough why Ramsauer3 designed an apparatus in which incident electrons were accelerated by the electric field and selected by the magnetic field to well defined low velocities. In this way, result of extraordinary decreasing of the effective cross section for scattering of slow incident electrons by argon, obtained previously by Mayer4, was confirmed. Ramsauer extended the measurements to He, Ne, Kr and Xe, and found the same effect in the case of Kr and Xe. Theoretical description of this effect by Faxen and Holtsmark5 was based on Rayleigh's ideas related to a sound wave as a sum of its harmonics. The elastic cross section of an atom has presented as the sum of the partial cross sections over all partial waves (i.e. angular momentum quantum numbers) of the incident wave. Bohr suggested the explanation for the falling down of the cross section: Spherical potential of Ar, as well as of Kr and Xe, may be deep enough to introduce one or more complete wavelengths of zero angular momentum, so the scattering can not been observed far from the atom.

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