Dissociative Charge Transfer between Ground-State HE+ and CO at Electron-Volt Energies

Details Dissociative Charge Transfer between Ground-State HE+ and CO at Electron-Volt Energies Dissociative Charge Transfer between Ground-State HE+ and CO at Electron-Volt Energies

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...536..954k&link_type=abstract

The Astrophysical Journal, Volume 536, Issue 2, pp. 954-958.

Astronomy and Astrophysics

Astronomy

6

Atomic Data, Atomic Processes, Ism: Molecules, Methods: Laboratory, Molecular Processes

Scientific paper

The major mechanism for the destruction of CO in the ejecta of the supernova SN 1987A has been assumed to be the fast dissociative charge transfer reaction of He+(1s)+CO-->products. However, no direct experimental data were available to confirm this hypothesis. In this measurement, we used the ion storage technique to measure the rate coefficient of this reaction within the temperature range of the ejecta. The measured rate coefficients are 1.33(+/-0.15)×10-9, 1.48(+/-0.15)×10-9, and 1.44(+/-0.12)×10-9 cm3 s-1 at 2.9×103, 8.7×103, and 1.2×104 K, respectively. The measured rate coefficients do not appear to be temperature dependent within this temperature range. Our measured value is consistent with the value used in the chemical modeling of the supernova SN 1987A ejecta.

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