Rotational excitation and de-excitation of CH+ molecules by 4He atoms
Institut des Sciences Moléculaires, UMR5255-CNRS, Université de Bordeaux, France e-mail: firstname.lastname@example.org
Accepted: 11 November 2009
We present a quantum mechanical investigation of rotational energy transfer in cold collisions of CH+ with 4He atoms. We use a global 3D potential energy surface obtained using the reproducing Kernel Hilbert Space (RKHS) method. Rotational deactivation transition cross-sections are performed for collision energy ranging from 10-6 to 3000 cm-1 and the corresponding rotational deactivation and excitation rate coefficients are evaluated for the transitions of levels up to j = 5 and temperatures up to 500 K. We also discuss the validity of the rigid rotor approximation for this collision.
Key words: molecular data / molecular processes / ISM: molecules / astrochemistry
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