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Investigations of the breakup dynamics of small molecular ions recombining with electrons
Stockholm University, Faculty of Science, Department of Physics.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dissociative recombination is the process in which a molecular ion recombines with an electron and then fragments into neutral products. This process has been studied in many experiments over the years at the ion storage ring CRYRING at the Manne Siegbahn Laboratory, Stockholm University. In this thesis the experimental methods and data analysis procedures used to investigate dissociative recombination are presented together with the results for several diatomic and triatomic ions. Cross sections and branching fractions of the different breakup channels have been determined. An imaging system was introduced to study the fragmentation channels in detail. The main focus is on the dynamics of the three-body breakup of triatomic dihydride ions. This work includes the results from the dissociative recombination of NO+, SH2+, SD2+, PD2+, NH2+, CH2+, H2O+ and H3+.

Place, publisher, year, edition, pages
Stockholm: Fysikum , 2005. , 61 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:su:diva-671ISBN: 91-7155-138-7 (print)OAI: oai:DiVA.org:su-671DiVA: diva2:196922
Public defence
2005-10-21, sal FD5, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:30
Opponent
Supervisors
Available from: 2005-09-26 Created: 2005-09-26Bibliographically approved
List of papers
1. Dissociative recombination of NO+: Dynamics of the X1Σ+ and a3Σ+ electronic states
Open this publication in new window or tab >>Dissociative recombination of NO+: Dynamics of the X1Σ+ and a3Σ+ electronic states
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2003 In: Journal of Chemical Physics, ISSN 0021-9606, Vol. 118, no 14, 6250-6259 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24168 (URN)
Note
Part of urn:nbn:se:su:diva-671Available from: 2005-09-26 Created: 2005-09-26Bibliographically approved
2. Investigating the breakup dynamics of dihydrogen sulfide ions recombining with electrons
Open this publication in new window or tab >>Investigating the breakup dynamics of dihydrogen sulfide ions recombining with electrons
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2005 In: Journal of Chemical Physics, ISSN 0021-9606, Vol. 122, no 22, 224314(8)- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24169 (URN)
Note
Part of urn:nbn:se:su:diva-671Available from: 2005-09-26 Created: 2005-09-26Bibliographically approved
3. Three-body fragmentation dynamics of amidogen and methylene radicals via dissociative recombination
Open this publication in new window or tab >>Three-body fragmentation dynamics of amidogen and methylene radicals via dissociative recombination
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2005 In: Physical Review A, ISSN 1050-2947, Vol. 71, no 3, 032711(16)- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24170 (URN)
Note
Part of urn:nbn:se:su:diva-671Available from: 2005-09-26 Created: 2005-09-26Bibliographically approved
4. Dissociative recombination study of PD2+ at CRYRING: absolute cross section, chemical branching ratios and three-body fragmentation dynamics
Open this publication in new window or tab >>Dissociative recombination study of PD2+ at CRYRING: absolute cross section, chemical branching ratios and three-body fragmentation dynamics
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2005 (English)In: Molecular Physics, ISSN 0026-8976, E-ISSN 1362-3028, Molecular Physics, ISSN 0026-8976, Vol. 103, no 20, 2735-2745 p.Article in journal (Refereed) Published
Abstract [en]

The paper reports an investigation of the dissociative recombination of   at the heavy-ion storage ring CRYRING. The absolute cross-section has been measured as a function of centre-of-mass energy ranging from 1 meV to 0.1 eV. The experiment performed has shown the dissociative recombination of   to be dominated by three-body break-up, with a branching ratio of about 78%. Competition between the available three-body channels producing the ground state, P(4S), and the first two excited states, P(2D) and P(2P), is observed. The formation of the first excited state dominates over the other two almost equally probable channels with about 75% of all three-body events. The results indicate that the kinetic energy released in the three-body break-up of   is randomly shared between the deuterium atoms. The intra-molecular angle on dissociation has also been investigated. A comparative analysis of the dissociative recombination dynamics for the two isovalent systems,   and  , is undertaken.

Place, publisher, year, edition, pages
Taylor & Francis, 2005
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:su:diva-24171 (URN)10.1080/00268970500185674 (DOI)
Note
Part of urn:nbn:se:su:diva-671Available from: 2005-09-26 Created: 2005-09-26 Last updated: 2017-12-13Bibliographically approved
5. Investigating the three-body fragmentation dynamics of water via the dissociative recombination and theoretical modeling calculations
Open this publication in new window or tab >>Investigating the three-body fragmentation dynamics of water via the dissociative recombination and theoretical modeling calculations
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2002 In: Physical Review A, ISSN 1050-2947, Vol. 66, no 3, 032715(16)- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24172 (URN)
Note
Part of urn:nbn:se:su:diva-671Available from: 2005-09-26 Created: 2005-09-26Bibliographically approved
6. Dissociative recombination of rotationally cold H3+
Open this publication in new window or tab >>Dissociative recombination of rotationally cold H3+
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2004 In: Physical Review A, ISSN 1050-2947, Vol. 70, no 5, 052716(12)- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24173 (URN)
Note
Part of urn:nbn:se:su:diva-671Available from: 2005-09-26 Created: 2005-09-26Bibliographically approved

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