| Abstract
| - With the use of recently computed diabatic potential energy surfaces (J. Chem. Phys.2001, 115, 3085) a fullab initio calculation was made of the bound energy levels of the Cl(2P)−HCl van der Waals complex fortotal angular momentum J = 1/2, 3/2, 5/2, and 7/2. The dissociation energy D0 of the complex was found to be337.8 cm-1 for J = 1/2 and |Ω| = 1/2, where Ω is the projection of J on the Cl−HCl bond axis. The complexis T-shaped in the ground state and in a series of stretch and bending excited states, with a van der Waalsbond length R of ∼3.2 Å. A series of states with linear geometry were also found, however, with |Ω| = 3/2and R≈ 3.9 Å, the lowest of which has a binding energy of 276.1 cm-1. The rovibronic levels were analyzedwith the help of one-dimensional calculations with R fixed at values ranging from 2.5 to 5.5 Å and the useof diabatic and adiabatic potential energy surfaces that both include the important spin−orbit coupling. Thestates of linear geometry are in qualitative agreement with previous work based on more approximate potentialenergy surfaces; the T-shaped states of considerably lower energy were not predicted earlier. Analysis of therotational structure and parity splitting of the rovibronic levels leads to the remarkable observation that thisT-shaped complex shows several features typical of a linear open-shell molecule.
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