Cold reactive and non-reactive collisions of Li and Rb with C${}_2^{-}$: implications for hybrid trap experiments

Abstract

We present a theoretical investigation of cold reactive and non-reactive collisions of Li and Rb atoms with C${}_2^{-}$. The potential energy surfaces for the singlet and triplet states of the Li--C${}_2^{-}$ and Rb--C${}_2^{-}$ systems have been obtained using the CASSCF/ic-MRCI+Q approach with extended basis sets. The potential energy surfaces are then used to investigate the associative detachment reaction and to calculate rotationally inelastic cross sections by means of the close-coupling method. The effect of the core correlation on the potential energy surfaces is discussed and we estimate the error on the collisional cross sections induced by freezing the $1s$ orbitals of the carbon atoms. The results are compared to those obtained for the Rb-OH${}^{-}$ system and the applications for hybrid trap experiments are explored. Furthermore, we discuss the possibility to perform Doppler thermometry on the C${}_2^{-}$ anion and investigate the collision process involving excited states. The implications for sympathetic cooling experiments are also discussed.

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Cited by in corpus (6)

• Cold hybrid ion-atom systems
• Interactions and chemical reactions in ionic alkali-metal and alkaline-earth-metal diatomic $A{B}^{+}$ and triatomic $A_2{B}^{+}$ systems
• Rovibrational quenching of C${}_2$-anions in collisions with He, Ne, and Ar atoms
• Spectroscopy and ion thermometry of C${}_2^{-}$ using laser-cooling transitions
• Cold collisions of C${}_2^{-}$ anions with Li and Rb atoms in hybrid traps
• Reactivity of hydrated hydroxide anion cluster OH(H${}_2$O)${}_n^{-}$ with H and Rb: an ab initio study