Advances In Gas Phase Ion Chemistry, Volume 3 (advances In Gas Phase Ion Chemistry)

ADVANCES IN GAS-PHASE ION CHEMISTRY Volume3 9 1998 This Page Intentionally Left Blank ADVANCES IN GAS-PHASE ION CHEMISTRY Editors: NIGEL G. ADAMS LUCIA M. BABCOCK Department of Chemistry University of Georgia VOLUME3 9 1998 @ Greenwich, Connecticut JAI PRESS INC. London, England Copyright 91998 by JAI PRESSINC. 55 Old Post Road, No. 2 Greenwich, Connecticut 06836 JAI PRESSLTD. 38 Tavistock Street Covent Garden London WC2E 7PB England All rights reserved. No part of this publication may be reproduced, stored on a retrieval system, or transmitted in any form, or by any means, electronic, mechanical, photocopying, filming, recording, or otherwise without prior permission in writing from the publisher. ISBN: 0-7623-0204-6 Manufactured in the United States of America CONTENTS LIST OF CONTRIBUTORS o ~ VII PREFACE Nigel G. Adams and Lucia M. Babcock ix ION-MOLECULE CHEMISTRY IN INTERSTELLAR CLOUDS: SUCCESSES AND PROBLEMS Eric Herbst COMPLEX FORMATION IN ELECTRON-ION RECOMBINATION OF MOLECULAR IONS R. Johnsen and J. B. A. Mitchell REACTIVE PROBING OF THE POTENTIAL ENERGY SURFACES OF ISOMERIC IONS Nigel G. Adams and Neyoka D. Fisher DYNAMICS OF GAS-PHASE SN2 NUCLEOPHILIC SUBSTITUTION REACTIONS William L. Hase, Haobin Wang, and Gilles H. Peslherbe 49 81 125 BARRIERS TO INTERNAL ROTATION IN SUBSTITUTED TOLUENES AND THEIR CATIONS: EFFECTS OF ELECTRONIC EXCITATION AND IONIZATION Erik C. Richard, Kueih-Tzu Lu, Robert A. Walker, and James C. Weisshaar THE INFLUENCE OF SOLVATION ON ION-MOLECULE REACTIONS 157 1 A. W. Castleman, Jr. 185 Contents vi THERMOCHEMISTRY OF SINGLY AND MULTIPLY CHARGED IONS PRODUCED BY ELECTROSPRAY John S. Klassen, Yeunghaw Ho, Arthur T. Blades, and Paul Kebarle POSITIVE ION-ELECTRON IMPACT IONIZATION CROSS SECTIONS: THEORY AND EXPERIMENT Peter W. Harland and Claire Vallance INDEX 255 319 359 LIST OF CONTRIBUTORS Nigel G. Adams Department of Chemistry University of Georgia Athens, Georgia Arthur T. Blades Department of Chemistry University of Alberta Edmonton, Alberta, Canada A. W. Castleman,Jr. Department of Chemistry The Pennsylvania State University University Park, Pennsylvania Neyoka D. Fisher Department of Chemistry University of Georgia Athens, Georgia Peter W. Harland Department of Chemistry University of Canterbury Christchurch, New Zealand William L. Hase Department of Chemistry Wayne State University Detroit, Michigan Eric Herbst Departments of Physics and Astronomy The Ohio State University Columbus, Ohio Yeunghaw Ho Department of Chemistry University of Alberta Edmonton, Alberta, Canada R. Johnsen Department of Physics and Astronomy University of Pittsburgh Pittsburgh, Pennsylvania vii viii LIST OF CONTRIBUTORS Paul Kebarle Department of Chemistry University of Alberta Edmonton, Alberta Canada John S. Klassen Department of Chemistry University of Alberta Edmonton, Alberta, Canada Kueih-Tzu Lu Synchrotron Radiation Research Center Hsinchu, Taiwan, Republic of China J.B.A. Mitchell Department of Physics and Astronomy University of Western Ontario London, Ontario, Canada; and PALMS Universit~ de Rennes I Rennes, France Gilles H. Peslherbe Department of Chemistry Wayne State University Detroit, Michigan Erik C Richard National Oceanic and Atmospheric Adminis