Fine-Structure Excitation of C+ and Si+ by Atomic Hydrogen

Details Fine-Structure Excitation of C+ and Si+ by Atomic Hydrogen Fine-Structure Excitation of C+ and Si+ by Atomic Hydrogen

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...620..537b&link_type=abstract

The Astrophysical Journal, Volume 620, Issue 1, pp. 537-541.

Astronomy and Astrophysics

Astronomy

10

Ism: Atoms, Ism: Molecules, Scattering

Scientific paper

We present calculations of cross sections for fine-structure excitation in collisions of carbon and silicon ions in the 2P state with atomic hydrogen in the ground state. The results are based on accurate calculations of CH+ and SiH+ molecular potentials, including electronic core correlation and relativistic effects. We find that the energy dependence of the excitation cross sections is largely determined by shape resonances. Our work improves on the results of previous calculations with less accurate potentials. Analytical expressions for the cooling efficiency of C+(2P1/2) and Si+(2P1/2) are given for the temperature interval 15-2000 K.

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