Proceedings of a NATO ARW held in Saint Jacut de la Mer, Brittany, France, May 3-8, 1992

Oral Contributions.- Polyatomic Ion Dissociative Recombination.- Recent Developments and Perspectives in the Treatment of Dissociative Recombination and Related Processes.- Characteristics of Superexcited States of Molecules and MQDT Studies of NO+ Dissociative Recombination.- Calculations for Ar + Xe* and ArXe+ + e.- Electron-Ion Continuum-Continuum Mixing in Dissociative Recombination.- A Theoretical Study of the HCO+ and HCS+ Electronic Dissociative Recombinations.- Dissociative Recombination of C2H2+ : Some Basic Information from Electronic Structure Calculations.- Theoretical Problems in the Dissociative Recombination of H2+ + e.- Recent Merged Beams Investigations of Hydrogen Molecular Ion Recombination.- Flowing Afterglow Studies of Electron-Ion Recombination using Langmuir Probes and Optical Spectroscopy.- Recent Flowing Afterglow Measurements.- Infrared Spectroscopic Studies of the Dissociative Recombination Processes of H3+.- Recombination of Cluster Ions.- Predissociation of Excited States of H3.- A Study of He2 (1,3?g+) Bound and Continuum States.- Electron Collision Induced Excitations and Dissociation of HeH+ using the R-Matrix Method.- Associative Ionisation of Hydrogen: Experiments with Fast Merged Beams.- Theory of the Asssociative Ionisation Reaction between Two Laser-Excited Sodium Atoms.- Resonant Theory of Dissociative Attachment.- Microscopic and Macroscopic Theories of Termolecular Recombination between Atomic Ions.- Dissociative Recombination in Planetary Ionospheres.- Chemistry of Supernova 1987a.- Dissociative Recombination in Interstellar Clouds.- Poster Contributions.- Product States of Ar2+ and Kr2+ Dissociative Recombination.- About Dissociative Recombination of HeH+.- Hydrogen and Deuterium Negative Ions Produced by CollisionalDissociation of H3+, D3+, and HD2+.- Factoring Sequences of Dynamic Processes in a Single Collision.- Dissociative Electron Attachment to Transition-Metal Hydrides.- Electron Impact Dissociative Excitation of Molecular Ions.- Participants.

InMay1988,theFirstInternationalConferenceonDissociativeRecombination:Theory, ExperimentandApplicationswasheldatChateauLakeLouise,Alberta,Canada. Thismeeting gaveaconsiderableimpetustothissubject,whichisofparticularinterestforalargevarietyof fieldsincludinginterstellarclouds,planetaryatmospheres,gaslasers,plasmaprocessing,ion sourcesandthermonuclearplasmas. Sincethen,indeed,severalcollaborationswereinitiated betweenexperimentalistsworkingwithdifferenttechniques,betweentheoreticiansdealingwith molecularstructureononehandanddynamicsontheotherhandandalsobetween experimentalistsandtheoreticians. Duringthelastfouryears,therefore,alargenumberof studieswerecarriedoutandraisedanewsetofquestions. Moreparticularly,theresultsthat wereobtainedconcerningcontroversialspeciessuchasH!andHeir,castingsomedoubton theverymechanismsbywhichdissociativerecombinationproceeds. The Second International Conference on Dissociative Recombination: Theory, ExperimentandApplications heldat"I'AbbayedeSaintJacutdelaMer",Brittany,France, May3-8,1992,camethereforeattherighttimetosurveythecurrentstateofthesubject. The symposiumbroughttogetherleadinginvestigatorsinthefieldsofmolecularionrecombination research,atomicandmoleculartheoryandexperiment,plasmasphysics,astrochemistryand aeronomy. Speakerspresentedtalksreviewingtheirownworkandthesewerefollowedby livelydiscussionsessions. Freetimeperiodsallowedparticipantstodiscoveranenchanting peninsulaofNorthBrittanywhilepursuingstimulatingscientificdiscussions. Thepapersinthis volumearebasedonthesetalksandfurtherdiscussions,withtheexceptionofcontributions fromT. AmanoandB. M. McLaughlinwhowereunabletoattend. Alistofparticipantsas wellasasouvenirgroupphotoisgivenattheendofthebook. WeareindebtedtoNATOforitsfinancialsupportwhichcontributedtothegreat successofthissecondmeeting. TheUniversityofRennesIandtheBalzerscompanyarealso acknowledgedfortheiradditionalsupportManythankstothewholestaffoftheabbeyforits kindnessandeffortsinprovidinguswithapropitiousenvironmentforsuchaworkshop. We arealsogratefultoL. Caubetforhervaluableadministrativeassistanceduringthepreparation ofthemeeting. Finallyaspecialmentionmustbegiventoallthesessionchairpersonsfortheir skillinorchestratingthediscussions. Lookingforwardtoattendingthethirdmeeting. TheEditors Bertrand R. Rowe J. Bria/l A. Mitchell Andre Callosa DepartementdePhysique DepartmentofPhysics DepartementdePhysique AtomiqueetMoleculaire TheUniversityofWesternOntario AtomiqueetMoleculaire UniversitedeRennesI London,Canada,N6A3K7 UniversitedeRennesI CampusdeBeaulieu CampusdeBeaulieu 35042RennesCedex, 35042RennesCedex, France France v CONTENTS ORALCONTRIBUTIONS PolyatomicIonDissociativeRecombination . 1 D. R. Bates RecentDevelopmentsandPerspectivesintheTreatmentofDissociative RecombinationandRelatedProcesses. . . . . . . . . . . . . . . . . . . . . . . . . . . 11 A. Giusti-Suzor, I. F Schneider, and 0. Dulieu CharacteristicsofSuperexcitedStatesofMoleculesandMQDTStudiesofNO+ DissociativeRecombination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 H. Sun, K. Nakashima, and H. Nakamura CalculationsforAr +Xe andArXe+ +e 35 A. P. Hickman, DL Huestis, and R. P. Saxon Electron-IonContinuum-ContinuumMixinginDissociativeRecombination 47 s. L. Guberman ATheoreticalStudyoftheHCO+andHCS+ElectronicDissociativeRecombinations. . 59 D. Talbi, and Y Ellinger DissociativeRecombinationofCH;:SomeBasicInformationfromElectronic 2 StructureCalculations. 67 WP. Kraemer TheoreticalProblemsintheDissociativeRecombinationofH~ +e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 H. Takagi RecentMergedBeamsInvestigationsofHydrogenMolecularIonRecombination. . . . . . . 87 J B. A. Mitchell, F B. Yousif, P. Van der Donk, and T. J Morgan vii FlowingAfterglowStudiesofElectron-IonRecombinationusingLangmuirProbesand OpticalSpectroscopy. . . . . . . 99 NG. Adams RecentFlowingAfterglowMeasurements . 113 B. R. Rowe