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Dissociative recombination and excitation of D-5(+) by collisions with low-energy electrons

Journal article
Authors Jan B. C. Pettersson
Patrik U Andersson
F. Hellberg
Jenny Öjekull
R. D. Thomas
M. Larsson
Published in Molecular Physics
Volume 113
Issue 15-16
Pages 2099-2104
ISSN 0026-8976
Publication year 2015
Published at Department of Chemistry and Molecular Biology
Pages 2099-2104
Language en
Links dx.doi.org/10.1080/00268976.2014.10...
Keywords dissociative recombination, dissociative excitation, WATER CLUSTER IONS, INFRARED-SPECTRUM, BRANCHING RATIOS, CROSS-SECTIONS, STORAGE-RING, IR-SPECTRA, H-3(+), H-5(+), PREDICTIONS, DYNAMICS, Physics, Atomic, Molecular & Chemical
Subject categories Atom and Molecular Physics and Optics

Abstract

We report results from high-resolution studies of D-5(+) cluster ion collisions with low-energy electrons performed in a heavy ion storage ring. Absolute dissociative recombination (DR) and dissociative excitation (DE) cross sections were determined for the energy range from 0.0005 to 20eV. The DR cross sections were exceedingly large at low energies, and DR resulted in efficient internal energy redistribution and pronounced fragmentation with two main product channels: D-2+3D (0.62 +/- 0.03) and 2D(2)+D (0.35 +/- 0.01). The DR and DE cross sections were comparable in the energy range from 0.2 to 20eV, which suggest that the two processes follow similar dynamics and are competing outcomes of the ion-electron interaction. A simple picture of the recombination process of D-5(+) which captures the essential physics is suggested. RAHAMSSON K, 1993, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM

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