Advances In Atomic And Molecular Physics, Vol. 22

Advances in ATOMIC AND MOLECULAR PHYSICS VOLUME 22 This Page Intentionally Left Blank ADVANCES IN ATOMIC AND MOLECULAR PHYSICS Edited by Sir David Bates DEPARTMENT OF APPLIED MATHEMATICS A N D THEORETICAL PHYSICS THE QUEEN’S UNIVERSITY OF BELFAST BELFAST, NORTHERN IRELAND Benjamin Bederson DEPARTMENT OF PHYSICS NEW YORK UNIVERSITY NEW YORK, NEW YORK VOLUME 22 1986 @) ACADEMIC PRESS, INC. Harcourt Brace Jovanovich, Publishers Orlando San Diego New York Austin Boston London Sydney Tokyo Toronto COPYRIGHT 0 1986 BY ACADEMIC PRESS, INC ALL RIGHTS RESERVED NO PART OF THIS PUBLICATION MAY BE REPRODUCED OR TRANSMITTED I N ANY FORM OR BY ANY MEANS. ELECTRONIC OR MECHANICAL, INCLUDING PHOTOCOPY, RECORDING, OR ANY INFORMATION STORAGE AND RETRIEVAL SYSTEM, WITHOUT PERMISSION IN WRITING FROM THE PUBLISHER. ACADEMIC PRESS, INC Orlando. Florida 32887 United Kingdom Edition published by ACADEMIC PRESS INC. (LONDON) 24-28 Oval Road. London NW I 7DX LIBRARY OF CONGRESS CATALOG CARD ISBN 0-12-003822-6 l ’ l ~ l Y I k I 1IN I H t L I N l r t l ) 5TArt\ 86 87 88 89 (alk. paper) Or AMkRICA Y 8 7 6 5 4 3 2 I LTD. NUMBER 65-18423 Contents Positronium-Its Formation and Interaction with Simple Systems J. W. Humberston I. 11. 111. IV. Introduction Positronium Formation in Positron - Atom Scattering The Interaction of Positronium with Simple Systems Concluding Remarks References 1 2 22 33 34 Experimental Aspects of Positron and Positronium Physics T. C. Grifith I. 11. 111. Introduction Annihilation Spectra for Positrons in Gases Cross-Section Measurements with Positron Beams References 37 39 52 72 Doubly Excited States, Including New Classification Schemes C.D.Lin I. 11. 111. IV. V. VI. VII. VIII. Introduction Analysis of Radial and Angular Correlations Classification of Doubly Excited States Solution of the Two-Electron Schrijdinger Equation in Hyperspherical Coordinates Body-Frame Analysis of Correlation Quantum Numbers Effects of Strong Electric Fields on Resonance Structures in H- Photodetachment Doubly Excited States of Multielectron Atoms Concluding Remarks and Perspectives References V 77 81 96 109 115 125 131 138 140 vi CONTENTS Measurements of Charge Transfer and Ionization in Collisions Involving Hydrogen Atoms I. 11. 111. IV. V. H . B. Gilbody Introduction Outline of Experimental Methods Charge Transfer Ionization Cross Sections for Electron Removal from Hydrogen Atoms in Collisions with Positive Ions References 143 144 152 182 189 192 - Electron - Ion and Ion Ion Collisions with Intersecting Beams K. Dolder and 3. Peart I. 11. 111. IV. V. VI . VII . VIII. IX. X. Introduction Notes on Experimental Techniques Ionization of Positive Atomic Ions by Electron Impact Measurements of Dielectronic Recombination Measurements of Electron-Impact Excitation of Positive Ions Scattering of Electrons by Ions Collisions between Electrons and Negative Ions Collisions between Electrons and Molecular Ions Collisions between Positive and Negative Ions Collisions between Positive Ions References 197 199 20 1 213 215 222 224 226 228 232 237 Electron Capture by Simple Ions Edward Pollack and Yukap Hahn I. 11. 111. IV . V. VI. VII. Introduction Theory Experimental Background Typical Studies Ion- Molecule Charge-ExchangeCollisions: He+ Ion -Molecule Collisions: Other Systems Electron-Transfer-Excitation Collisions References + H2 243 244 26 1 266 273 293 305 3 10 Relativistic Heavy-Ion- Atom Collisions R. Anh