Vibrational cooling of D2+in an ion storage ring as revealed by dissociative recombination measurements
- 14 April 1994
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 27 (7) , 1397-1406
- https://doi.org/10.1088/0953-4075/27/7/015
Abstract
It is demonstrated that a substantial degree of vibrational cooling of an infrared inactive molecule can be achieved by means of storage in an ion cooler ring. The cross section for dissociative recombination of D2+ has been measured in the storage ring CRYRING using 6 MeV amu-1 ions and variable storage times prior to data taking. By using a simple model for describing the recombination process, it is inferred that 68% of the D2+ ions remaining in the ring after 22.5 s populate nu =0. It is proposed that the removal of vibrational excitation contained in the ions injected into the ring is due to collisions in the rest gas. The rate coefficient measured for 22.5 s storage time, alpha (T=300 K)=2.3*10-8 cm3 s-1 is in very good agreement with theoretical predictions.Keywords
This publication has 17 references indexed in Scilit:
- Electron cooling at CRYRINGPhysica Scripta, 1993
- CRYRING — a synchrotron, cooler and storage ringNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993
- Dissociative recombination of coldat the Test Storage RingPhysical Review Letters, 1993
- Direct high-energy neutral-channel dissociative recombination of coldin an ion storage ringPhysical Review Letters, 1993
- Bound → continuum intensities — A computer program for calculating absorption coefficients, emission intensities or (golden rule) predissociation ratesComputer Physics Communications, 1989
- The doubly excited autoionizing states of H2The Journal of Chemical Physics, 1983
- Merged electron-ion beam experiments. I. Method and measurements of (e-H2+) and (e-H3+) dissociative-recombination cross sectionsJournal of Physics B: Atomic and Molecular Physics, 1977
- Dissociative recombination of the hydrogen molecular ionJournal of Physics B: Atomic and Molecular Physics, 1976
- Vibrational spacings for H2+, D2+and H2Molecular Physics, 1973
- Dissociation of Molecular Ions by Electric and Magnetic FieldsPhysical Review B, 1961