Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..gecxf1002c&link_type=abstract
American Physical Society, 56th Gaseous Electronics Conference, October 21-24, 2003, San Francisco, California, MEETING ID: GEC0
Physics
Scientific paper
Dissociative recombination (DR) is the primary mechanism for electron loss in ionized, low-pressure molecular gases and plasmas, such as planetary ionospheres. Through the use of heavy ion storage rings, there has been considerable progress in recent years in characterizing both the cross sections and the products produced by DR reactions. DR can in principle be strongly dependent on specific rotational, vibrational, and electronic states of the ion, but current work has allowed only investigating ground state species or uncharacterized internal state distributions. We report here the first experimental determination of cross sections and products produced in the DR of the oxygen molecular ion in its ground state vibrational levels v = 0, 1, 2, 3, and 4, which are crucial to understanding the loss of this ion in the Venus ionosphere. In particular, our measurements show substantial variations (factors of 5) in the DR cross sections among these low levels. Our measurements were made at CRYRING using a variable pressure electron-impact ion source with the ion populations characterized by dissociative charge transfer in cesium vapor. This work is partially supported by the NASA Planetary Atmospheres Program under grant NAG5-11173.
Cosby Philip C.
Hellberg Fredrik
Huestis David L.
Larsson Martin
Peterson James R.
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