Abstract
The dissociative recombination (DR) of a molecular ion AB+:
is an important process for determining the electronic densities and the molecular abundances in the ionosphere or in the interstellar medium. A new generation of experiments, very promising as a source of astrophysical data, is being developped since a few years (Tanabe et al 1993, Forck et al 1993, Larsson et al 1993): Several experimental groups using ion storage rings to study atomic ions recently turned to store molecular ions (TARN at Tokyo, TSR at Heidelberg, CRYRING at Stockholm, ASTRID at Aarhus). The residence time of the ions may reach several tens of seconds, allowing relaxation of all the electronic and (at least for heteronuclear ions with a permanent dipole) vibrational excited states. Additional phase-space cooling is achieved using an electron cooler device, which also provides the recombining electrons. The DR cross section is then measured as a function of the relative velocity between the electron and ion merged beams. As an example, Figure 1 shows the device used at CRYRING. The reader can find detailed experimental information in the review papers by Forck et al (1993) and by Larsson (1995).
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Suzor-Weiner, A., Schneider, I.F., Carata, L. (1997). Dissociative Recombination: New Developments Stimulated By Ion Storage Ring Experiments. In: Burke, P.G., Joachain, C.J. (eds) Photon and Electron Collisions with Atoms and Molecules. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5917-7_7
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