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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
InfraredSpectroscopicStudiesoftheDissociativeRecombinationProcessesofH...127
3 T. Amano RecombinationofClusterIons . 135 R. Johnsen
PredissociationofExcitedStatesofH . . 145 3 H. Helm AStudyofHe
e,3I,;)BoundandContinuumStates...155 2 CJ Gillan, B. M McLaughlin.
and P. G. Burke
ElectronCollisionInducedExcitationsandDissociationofHeH+usingthe
R-MatrixMethod . . 163 BK Sarpal, J Tennyson, and L. A. Morgan
AssociativeIonisationofHydrogen:ExperimentswithFastMergedBeams...173
F Brouillard, andX Urbain
TheoryoftheAsssociativeIonisationReactionbetweenTwoLaser-Excited .
187 SodiumAtoms 0. Du!ieu, A. Giusti-Suzor, andF Masnou-Seeuws
ResonantTheoryofDissociativeAttachment...195 J. J. Fabrikant
MicroscopicandMacroscopicTheoriesofTermolecularRecombinationbetween
AtomicIons...205 MR. Flannery
DissociativeRecombinationinPlanetaryIonospheres . . 219 JL. Fox
ChemistryofSupernova1987a . 243 A. Dalgarno
DissociativeRecombinationinInterstellarClouds . .
Radioastronomy has painted an extraordinary picture of the Galactic
interstellar medium, which displays an amazing organization and
structuring of matter from very hot ultra-diluted media to very
cold denser milieus considered as the cradles of stars. In these
latter environments, the discovery of a chemical diversity of
molecules, including those associated with precursors to life
itself, immediately brought to light the question of the mechanisms
leading to their formation and persistence at temperatures as low
as 10 K. The chemical networks developed to understand telescope
observations required a great deal of physical and chemical
parameters relevant to interstellar conditions, particularly at
very low temperatures. These included the rate coefficients of
thousands of gas phase chemical reactions. Such data were missing
in the 1970s, when the very first molecular discoveries were made.
Then, in the early eighties, it was realized that uniform
supersonic flows were ideal chemical reactors to study reaction
kinetics at interstellar temperatures.Uniform Supersonic Flows in
Chemical Physics reviews 40 years of use of such reactors, the
so-called CRESU machines, focusing on major breakthroughs brought
to chemical physics, physical chemistry, astrophysics and
astrochemistry by the various experiments carried out with such
apparatuses. The wealth of kinetic data at very low temperatures
provided new targets for the predictions of theory, with new
theoretical methods being developed to explain observed behavior.
The first two chapters describe the physical context of reaction
kinetics at very low temperatures and the requirements needed to
run optimally such uniform supersonic flows, together with a
historical perspective. Chapters 3 to 9 describe the various
families of chemical processes that have been explored within the
CRESU technique, highlighting major advances and offering an
exhaustive up-to-date bibliography. Chapters 10 and 11 show how
these experimental results have helped in improving the ideas in
quantum chemistry and interstellar modeling. The book concludes
with an overview of potential perspectives and new routes to be
explored.
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