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Dissociative recombination of D+(D2O)(2) water cluster ions with free electrons
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2002 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 117, no 11, 5264-5270 p.Article in journal (Refereed) Published
Abstract [en]

Dissociative recombination (DR) of the water cluster ion D+(D2O)(2) has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). Cluster ions were injected into the ring and accelerated to an energy of 2.28 MeV. The stored ion beam was merged with an almost monoenergetic electron beam, and neutral fragments produced by DR were detected by an energy-sensitive surface barrier detector. The first experimental determinations of the absolute DR cross section and branching ratios for a cluster ion are reported. The cross section for the process D+(D2O)(2)+e(-) is large and reaches 6.10(-12) cm(2) at a low center-of-mass collision energy of 0.001 eV. The cross section has an E-1.19+/-0.02 dependence in the energy range 0.001-0.0052 eV, and a steeper slope with an E-1.70+/-0.12 dependence for E=0.052-0.324 eV. The general trends are similar to the results for previously studied molecular ions, but the cross section is higher in absolute numbers for the cluster ion. Thermal rate coefficients for electron temperatures of 50-2000 K are deduced from the cross section data and the rate coefficients are consequently also large. Branching ratios for the product channels are determined with a grid technique. Break-up into 2D(2)O+D is the dominating dissociation channel with a probability of 0.94+/-0.04. The channel resulting in the fragments D2O+OD+D-2 has a probability of 0.04+/-0.02, and the probability for formation of D3O+D2O is 0.02+/-0.03. The results are compared with data for molecular ions, and the cluster dissociation dynamics are discussed.

Place, publisher, year, edition, pages
2002. Vol. 117, no 11, 5264-5270 p.
Keyword [en]
Deuterium, Dissociation, Electron beams, Electron transitions, Heavy ions, Particle detectors, Plasma sources, Scintillation, Storage rings
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-26365DOI: 10.1063/1.1486436ISI: 000177684400018OAI: oai:DiVA.org:kth-26365DiVA: diva2:372069
Note
QC 20101124Available from: 2010-11-24 Created: 2010-11-24 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Ioniztion of molecules at the CRYRING facility
Open this publication in new window or tab >>Ioniztion of molecules at the CRYRING facility
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 40 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006.42
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-3993 (URN)
Presentation
2006-06-08, Sal FA32, AlbaNova, Roslagstullsbacken 21, Stockholm, 09:00
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Supervisors
Note
QC 20101124Available from: 2006-05-24 Created: 2006-05-24 Last updated: 2010-11-24Bibliographically approved

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