Aims. The radiative charge transfer and association processes in Li− + H collisions are studied in the 10 −10 −10 eV center-of-mass energy range. Methods. we carried out total and ν-resolved state-selective cross sections have been carried out by using the fully quantum, optical potential, and semiclassical methods. Results. In the energy region below ∼0.8 eV, the radiative association process is the dominant decay channel, while radiative charge transfer dominates at higher energies. Rich resonance structures are observed in the cross sections of both processes in the 0.1−1.5 eV energy range; These structures are associated with the quasi-bound states below the top of the centrifugal barrier of the effective potential in the entrance channel for specific vibrational and angular momentum states. It is found that with the increase of collision energy, the resonances occur for higher angular momentum states and lower vibrational states. Besides the cross sections for the studied processes we also present their reaction rate coefficients in the 10 −6 -10 6 K temperature range.
The charge exchange and collisional detachment processes in H − +Li and Li − +H collisions have been studied by using the quantal molecular orbital close-coupling (QMOCC) method in the energy ranges of about 0.12-1000 eV u −1 and 0.1 meV-1000 eV, respectively, and the inelastic collision cross sections and rate coefficients have been computed and presented. It is found that the electron transfer process in the H − +Li and Li − +H collisions is due to the Demkov coupling between the 1 2 Σ + and 2 2 Σ + states at internuclear distances of about 15a 0 . The collisional electron detachment in the considered collision system is due to the excitation of the remaining six states, which are all unstable against autodetachment. These states are populated through a series of Landau-Zener couplings of the 2 2 Σ + state with upper 2 Σ + states and by the rotational 2 Σ + -2 Π couplings at small internuclear distances. The cross sections for electron transfer in H − +Li and Li − +H collisions in the energy range of 10-1000 eV u −1 attain values in the range of 10 −16 -10 −15 cm 2 (reaching their maximum values of about 5×10 −15 cm 2 at 500-600 eV u −1 ), while the values of the corresponding electron detachment cross sections in this energy range attain generally smaller values.
Carbon sulfide cation (CS+) plays a dominant role in some astrophysical atmosphere environments. In this work, the rovibrational transition lines are computed for the lowest three electronic states, in which the internally contracted multireference configuration interaction approach (MRCI) with Davison size-extensivity correction (+Q) is employed to calculate the potential curves and dipole moments, and then the vibrational energies and spectroscopic constants are extracted. The Frank–Condon factors are calculated for the bands of X 2 Σ + − A 2 Π and X 2 Σ + − B 2 Σ + systems, and the band of X 2 Σ + − A 2 Π is in good agreement with the available experimental results. Transition dipole moments and the radiative lifetimes of the low-lying three states are evaluated. The opacities of the CS+ molecule are computed at different temperatures under the pressure of 100 atms. It is found that as temperature increases, the band systems associated with different transitions for the three states become dim because of the increased population on the vibrational states and excited electronic states at high temperature.
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