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.
@article{arxiv.0909.2010,
title = {Rotational excitation of methylidynium (CH+) by a helium atom at high temperature},
author = {K. Hammami and L. C. Owono Owono and P. Staeuber},
journal= {arXiv preprint arXiv:0909.2010},
year = {2015}
}
Comments
4 pages, 3 figures, table with rate coefficients, accepted for publication by A&A