Advances in ATOMIC AND MOLECULAR PHYSICS VOLUME 5 CONTRIBUTORS TO THIS VOLUME A. BEN-REUVEN C. D. H. CHISHOLM R. J. S. CROSSLEY A. DALGARNO H. G. DEHMELT HOLLY THOMIS DOYLE F. C. FEHSENFELD E. E. FERGUSON F. R. INNES ROY H. NEYNABER A. L. SCHMELTEKOPF 0. SCHNEPP ADVANCES IN ATOMIC AND MOLECULAR PHYSICS Edited by D. R. Bates DEPARTMENT OF APPLIED MATHEMATICS THE QUEEN'SUNIVERSITYOF BELFAST BELFAST, NORTHERN IRELAND Immanuel Estermann DEPARTMENT OF PHYSICS THE TECHNION ISRAEL INSTITUTE OF TECHNOLOGY HAIFA, ISRAEL VOLUME 5 @) 1969 ACADEMIC PRESS New York London COPYRIGHT 0 1969, BY ACADEMIC PRESS,INC. ALL RIGHTS RESERVED NO PART OF THIS BOOK MAY BE REPRODUCED IN ANY FORM, BY PHOTOSTAT, MICROFILM, RETRIEVAL SYSTEM, OR ANY OTHER MEANS, WITHOUT WRITTEN PERMISSION FROM THE PUBLISHERS. ACADEMIC PRESS, INC. 111 Fifth Avenue, New York, New York 10003 United Kingdom Edition published by ACADEMIC PRESS, INC. (LONDON) LTD. Berkeley Square House, London W l X 6BA LIBRARY OF CONGRESS CATALOG CARDNUMBER : 65-18423 PRINTED IN THE UNITED STATES OF AMERICA List of Contributors Numbers in parentheses indicate the pages on which the authors' contributions begin. A. BEN-REUVEN, The Weizmann Institute of Science, Rehovot, Israel (201) C. D. H. CHISHOLM, Department of Chemistry, The University, Sheffield, Yorkshire (297) R. J. S. CROSSLEY, Department of Mathematics, University of York, York, England (237) A. DALGARNO, Harvard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, Massachusetts (297) H. G. DEHMELT, Department of Physics, University of Washington, Seattle, Washington (109) HOLLY THOMIS DOYLE, Harvard College Observatory, Cambridge, Massachusetts (337) F. C. FEHSENFELD, Environmental Science Services Administration, Boulder, Colorado (1) E. E. FERGUSON, Environmental Science Services Administration, Boulder, Colorado ( I ) F. R. INNES, Air Force Cambridge Research Laboratories, Bedford, Massachusetts (297) ROY H. NEYNABER, Space Science Laboratory, General Dynamics/ Convair, San Diego, California (57) A. L. SCHMELTEKOPF, Environmental Science Services Administration, Boulder, Colorado (1) 0. SCHNEPP, Department of Chemistry, University of Southern California, Los Angeles, California (1 55) V This Page Intentionally Left Blank Foreword This serial publication is intended to occupy an intermediate position between a scientific journal and a monograph. Its main object is to provide survey articles in fields such as the following: atomic and molecular structure and spectra, masers and optical pumping, mass spectroscopy, collisions, transport phenomena, physical and chemical interactions with surfaces, gas kinetic theory. It is the aim of the editors to select articles which combine a rigorous yet understandable introduction to their subject, a summary of past work with emphasis on progress in the last five years, and a sufficiently complete bibliography to enable the reader to locate quickly relevant details in the literature. Suggestions for topics to be covered in the future will be appreciated. D. R. BATES I. ESTERMANN Belfast, Northern Ireland Haifa, Israel vii This Page Intentionally Left Blank Contents V LISTOF CONTRIBUTORS FOREWORD CONTENTS OF PREVIOUS VOLUMES vii xiii Flowing Afterglow Measurements of Ion-Neutral Reactions E. E. Ferguson, F. C. Fehsenfeld, and A . L. Schmeltekopf I. Historical Introduction 11. General Experimental Aspects of the Flowing Afterglow Technique 111. The Flow Analysis IV. Data Reduction V. Production of Reactant Species VI. Optical Spectroscopic Studies VII. Temperature-Variable Flowing Afterglow Studies VIII. Some Miscellaneous Results IX. Summary Reference