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• W2121801727 abstract "The potential energy surfaces and the calculated rovibronic spectrum of the electronic ground state of the van der Waals He–HCl+ cation are presented. The system is in a X 2Π electronic state at linearity, which splits into an A′ and an A″ state upon bending, leading to a Renner–Teller effect. Three-dimensional potential energy surfaces have been determined using the partially spin-restricted open-shell single and double excitation coupled cluster method with perturbative triples [RCCSD(T)]. The absolute minimum of a two-dimensional surface with the diatom bond length r fixed at r e = 2.489 a 0 is located at the linear He–HCl+ geometry with a van der Waals bond length R of 5.98 a 0 and D e ≃ 300 cm−1. The minimum in the full three-dimensional potential occurs for a slightly larger value of r: 2.492 a 0. The rovibronic levels of the He–HCl+ complex have been computed by a variational method for total angular momenta J =1/2, 3/2, 5/2, 7/2 and 9/2. The binding energy D 0 is calculated as 161.5 cm−1 using the two-dimensional potential energy surfaces with r frozen at r e and as 163.5 cm−1 in full three-dimensional calculations. Owing to the large and negative value of the spin–orbit parameter in HCl+ (A SO = −648.13 cm−1), all the considered rovibronic states correspond to the |Ω| = 3/2 spin–orbit component of HCl+. The nuclear wave functions of the complex could be interpreted using the model of a slightly hindered diatomic rotor. The energy level pattern and wave functions have been compared with the more floppy Ar–OH complex on the one hand and the more rigid He–HF+ system on the other. The anisotropy of the potential energy surface of the He–HCl+ complex is intermediate between these two cases and the rovibronic states reflect this property." @default.
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• W2121801727 date "2004-11-10" @default.
• W2121801727 modified "2023-09-29" @default.
• W2121801727 title "Rovibronic spectroscopy of the van der Waals complex He–HCl⁺" @default.
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• W2121801727 doi "https://doi.org/10.1080/00268970412331290652" @default.
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