Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995isrl.rept.....g&link_type=abstract
Final Report, 1 Dec. 1991 - 28 Feb. 1995 Institute for Scientific Research, Lexington, MA.
Astronomy and Astrophysics
Astronomy
Abundance, Curves (Geometry), Helium Hydrogen Atmospheres, Helium Ions, Hydrogen Ions, Interstellar Gas, Planetary Nebulae, Potential Energy, Recombination Coefficient, Recombination Reactions, Supernovae, Astronomical Models, Born-Oppenheimer Approximation, Cross Sections, Electron Capture, Gas Dissociation, Interstellar Chemistry, Mathematical Models
Scientific paper
We have been studying the dissociative recombination (DR) of HeH(+) with an electron with the goal of calculating accurate cross sections and rate coefficients to allow for the accurate modelling of the abundance of HeH(+) in planetary nebulae and supernova envelopes. A unique feature of the HeH potential curves is that none of the neutral states cross the ion curve. This required a new approach to the calculation of DR cross sections and rate coefficients that had not yet appeared in the literature. Because of the lack of a potential curve crossing, the initial electron capture occurs by Born-Oppenheimer breakdown, i.e. by the interaction of the motion of the incoming electron with the nuclear motion. This same mechanism also drives DR in H3(+) and the methods developed and described below for HeH(+) DR will be used for the future calculation of H3(+) DR.
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