Rotational excitation and de-excitation of CH+ molecules by 4He atoms

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 col...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2010-02, Vol.511
Main Authors: Turpin, F., Stoecklin, T., Voronin, A.
Format: Article
Language:English
Subjects:
astrochemistry
Astronomy
Earth, ocean, space
Exact sciences and technology
ISM: molecules
molecular data
molecular processes
Online Access:Get full text
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Summary: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.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/200912744