Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..531b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 531-534.
Astronomy and Astrophysics
Astrophysics
24
Dissociation, Molecular Ions, Polyatomic Molecules, Recombination Reactions, Chemical Bonds, Free Radicals, Molecular Energy Levels, Reaction Kinetics, Valence
Scientific paper
Dissociative recombination depends on favorable crossings of potentials. Factors relating to such crossings are discussed. There are two main classes of saturated polyatomic ion. A member of the first class has a free valence or contains an ionized atom the number of whose valences increases on neutralization. Breaking a bond yields radicals, and generally there are enough accessible potentials to make a favorable crossing quite likely. A member of the second class contains an ionized atom, the number of whose valences decreases on neutralization so that one of the products of breaking a bond is a saturated molecule and only a single potential is accessible. In this circumstance there is unlikely to be a favorable crossing. However, in many cases a favorable crossing is to be expected for the channel in which two H atoms are shed and an H2 molecule is formed from them. Dissociative recombination probably never breaks C(+)=O and C(+)=N in polyatomic ions but may break C(+)=C bonds.
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