Radiative association of C(${}^{3}P$) and H${}^{+}$: Triplet states

Abstract

The radiative association of C(${}^{3}P$) and H${}^{+}$ is investigated by calculating cross sections for photon emission into bound ro-vibrational states of CH${}^{+}$ from the vibrational continua of initial triplet d${}^3\Pi$ or b${}^3{\Sigma }^{-}$ states. Potential energy curves and transition dipole moments are calculated using multi-reference configuration interaction (MRCI) methods with AV6Z basis sets. The cross sections are evaluated using quantum-mechanical methods and rate coefficients are calculated. The rate coefficients are about 100 times larger than those for radiative association of C${}^{+}({}^2{P}^o)$ and H from the A${}^1\Pi$ state. We also confirm that the formation of CH${}^{+}$ by radiative association of C${}^{+}({}^2{P}^o)$ and H via the triplet c${}^3{\Sigma }^{+}$ state is a minor process.

Accepted for publication in MNRAS. 7 pages, 7 figures

References in corpus (4)

• The chemistry of ions in the Orion Bar I. - CH+, SH+, and CF+: The effect of high electron density and vibrationally excited H2 in a warm PDR surface
• Herschel/HIFI Spectral Mapping of C${}^{+}$, CH${}^{+}$, and CH in Orion BN/KL: The Prevailing Role of Ultraviolet Irradiation in CH${}^{+}$ Formation
• Recommended Thermal Rate Coefficients for the C + H${}_3^{+}$ Reaction and Some Astrochemical Implications
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Cited by in corpus (2)

• Dicarbon formation in collisions of two carbon atoms
• Radiative Charge Transfer Between the Helium Ion and Argon