Electron-impact rotational excitation of CH^+

Details Electron-impact rotational excitation of CH^+ Electron-impact rotational excitation of CH^+

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.306..473l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 306, Issue 2, pp. 473-478.

Astronomy and Astrophysics

Astronomy

12

Molecular Data, Molecular Processes, Planetary Nebulae: Individual: Ngc 7027

Scientific paper

New coupled-state R-matrix calculations are performed at energies up to 1 eV to give rotational excitation and de-excitation cross-sections for electron collisions with CH^+. Rotational excitations with Delta j up to 7 are considered. Transitions with Delta j up to 6 are found to have appreciable cross-sections, those with Delta j = 2 being comparable to (indeed slightly larger than) those with Delta j = 1, the only ones considered previously. Rates for electron temperatures up to 15 000 K and critical electron densities are given. A model of CH^+ rotational populations shows them to be relatively insensitive to electron temperatures in the range 800-2000 K, but to depend strongly upon electron density. The models predict a significant population in rotational states with j > 1 even at low electron densities; at higher densities the possibility exists that electron collisions alone might explain the recently observed populations in the planetary nebula NGC 7027.

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