Dissociative recombination of H{sub 2}D{sup +}: Cross sections, branching fractions, and isotope effects

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.52.2901· OSTI ID:118455

Datz, S; Larsson, M; Stromholm, C; Sundstroem, G; Zengin, V; Danared, H; Kaellberg, A; Ugglas, M a ^[1]

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1. Physics Division, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, Tennessee 37831 (United States)

We have used the CRYRING heavy-ion storage ring at the Manne Siegbahn Laboratory in Stockholm to store and cool beams of H{sub 2}D{sup +}. These beams circulate with energies of MeV per amu and are merged with an electron beam traveling at nearly the same velocity. In this way, relative energies from a fraction of a meV to tens of an eV are achieved. When dissociative recombination (DR) takes place, the neutral fragments exit the ring and strike a detector, enabling the measurement of total DR cross sections. Using this technique, coupled with a ``translucent barrier`` in which some particles pass directly through holes and others pass through a thin solid and lose part of their energy before striking the detector, we are able to measure the total cross section for DR in H{sub 3}{sup +} and the branching into the three-body (H+H+H) channel and the two-body (H{sub 2}+H) channel. Coupling this method with the use of energy absorbers, we are able to measure these quantities for H{sub 2}D{sup +} and the separate two-body channels HD+H and H{sub 2}+D. An isotope effect is observed favoring the formation of HD.

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 118455
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 52; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COUPLING
CROSS SECTIONS
DEUTERATION
DEUTERIUM COMPOUNDS
DEUTERIUM IONS
HYDROGEN DEUTERIDE
HYDROGEN IONS 3 PLUS
ISOTOPE EFFECTS
MEV RANGE
MOLECULAR IONS
RECOMBINATION