Rotational excitation of methylidynium (CH+) by a helium atom at high temperature

Details Rotational excitation of methylidynium (CH+) by a helium atom at high temperature Rotational excitation of methylidynium (CH+) by a helium atom at high temperature

2009-09-10

arxiv.org/abs/0909.2010v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 3 figures, table with rate coefficients, accepted for publication by A&A

Scientific paper

We aim to obtain accurate rate coefficients for the collisional excitation of CH+ by He for high gas temperatures. The ab initio coupled-cluster [CCSD(T)] approximation was used to compute the interaction potential energy. Cross sections are then derived in the close coupling (CC) approach and rate coefficients inferred by averaging these cross sections over a Maxwell-Boltzmann distribution of kinetic energies. Cross sections are calculated up to 10'000 cm^-1 for J ranging from 0 to 10. Rate coefficients are obtained at high temperatures up to 2000 K.

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